I changed the fuel filter, fuel pump, spark plugs, check the injectors,check the oxygen sensors and my truck is still running funny. It starts and after you drive it for about 15 minutes the rpm gauge starts going up and down and it than starts to shake like it's starving for gas and i have gas in it than the engine stalls out and it takes forever to start back up

If your 1994 Chevy S-10 won't start and you're detecting a strong smell of fuel, it could be an indication of a rich fuel mixture. Here are some possible reasons and steps you can take to troubleshoot the issue:

1. Check for Spark:
- Ensure that the spark plugs are firing. Remove one spark plug wire, insert a spare spark plug into the wire, and ground the plug against the engine block. Have someone crank the engine while you observe for a spark. If there's no spark, it could be an issue with the ignition system (spark plugs, ignition coil, distributor, etc.).

2. Inspect the Fuel System:
- Check the fuel system for issues. Confirm that the fuel pump is delivering fuel to the engine. You can listen for the fuel pump whirring sound when you turn the key to the "ON" position. If you don't hear it, there might be a problem with the fuel pump or its electrical components.

3. Examine the Fuel Injectors:
- If the engine is getting too much fuel, it could be a problem with the fuel injectors. They may be stuck open or leaking. Consider having the fuel injectors inspected and cleaned or replaced if necessary.

4. Check the Coolant Temperature Sensor:
- The coolant temperature sensor plays a role in adjusting the fuel mixture based on engine temperature. If it's faulty, it might send incorrect signals to the engine control module (ECM), leading to a rich fuel mixture.

5. Inspect the Throttle Position Sensor (TPS):
- The TPS is responsible for telling the ECM the position of the throttle. A malfunctioning TPS could lead to incorrect fuel delivery. It's worth checking its condition and replacing it if needed.

6. Examine the Oxygen Sensor:
- A faulty oxygen sensor may not accurately measure the oxygen content in the exhaust gases, causing the ECM to incorrectly adjust the fuel mixture. Consider checking and replacing the oxygen sensor if necessary.

7. Check for Vacuum Leaks:
- Vacuum leaks can cause an imbalance in the air-fuel mixture. Inspect vacuum hoses and connections for any signs of leaks or damage.

8. Inspect the Air Intake System:
- Ensure that the air filter is clean and not clogged. A restricted air intake can affect the air-fuel mixture.

9. Scan for Error Codes:
- Use an OBD-II scanner to check for any error codes stored in the ECM. This can provide valuable information about potential issues with sensors or other components.
If you're not comfortable performing these checks or if the issue persists, it's recommended to seek the assistance of a qualified mechanic who can perform a more comprehensive diagnosis and address the specific problem with your 1994 Chevy S-10.

If it is not firing on one cylinder, check and eventually replace distributor rotor, or electronic injection module.
Check also for camshaft problems.

There could be several reasons why your Daihatsu Terios is consuming too much fuel. Here are some possible causes and remedies.Driving habits: Your driving habits could be the cause of the high fuel consumption. Aggressive driving, speeding, and rapid acceleration can all increase fuel consumption. To remedy this, try driving more conservatively and avoid sudden stops and starts. Tire pressure: Low tire pressure can increase fuel consumption. Make sure your tires are properly inflated to the recommended pressure levels. Air filter: A dirty air filter can cause the engine to work harder and burn more fuel. Replace your air filter regularly to keep it clean and functioning properly. Fuel injectors: Dirty or clogged fuel injectors can cause the engine to burn more fuel. Have your fuel injectors cleaned or replaced if necessary. Oxygen sensor: A malfunctioning oxygen sensor can cause the engine to burn more fuel than necessary. Have your oxygen sensor checked and replaced if needed. Spark plugs: Worn or dirty spark plugs can cause the engine to run inefficiently and burn more fuel. Replace your spark plugs regularly to keep them functioning properly. It's important to have your vehicle inspected by a qualified mechanic to determine the root cause of the high fuel consumption. By addressing the underlying issue, you can improve your vehicle's fuel efficiency and save money on gas in the long run.

Some possible causes could include:

1. A malfunctioning oxygen sensor: The oxygen sensor measures the amount of oxygen in the exhaust and sends this information to the engine control module. If the oxygen sensor is faulty, the engine may run too rich or too lean, which can result in excessive fuel consumption.
2. A clogged air filter: A clogged air filter can restrict airflow to the engine, causing it to work harder and use more fuel.
3. A faulty fuel pump: If the fuel pump is not working properly, it may not be delivering an adequate supply of fuel to the engine, causing it to consume more fuel in order to compensate.
4. A leaking fuel injector: A leaking fuel injector can allow fuel to escape from the engine, leading to an increase in fuel consumption.

To determine the cause of the excessive fuel consumption in your Mazda Demio, it is best to have it diagnosed by a mechanic. They will be able to perform tests and inspections to identify the problem and suggest the appropriate repairs.

Might be an injector.

Try putting in an additive in your gas tank that cleans the fuel injectors. if your fuel filter was that dirty, the fuel injectors may be gummed up.

Borrow a fuel pressure tester from Auto Zone and test the fuel system. It could be that you have a bad fuel pump or fuel pressure regulator. It also could be a plugged fuel filter.

Hi, Try to replace fuel filter. It maybe clogged up and making engine run rough or poor. Also check and replace spark plugs. A bad spark plug will make it run rough too. Good luck.

An exhaust system leak could give the O2 Sensor
extra oxygen & cause the fuel injector timing to be
wrong.

Have you run fuel injector cleaner through the fuel system?