My 96 bronco 5.8 stumbles on acceleration.

Hello Joe

Clean the Throttle Body and MAF. Check for codes.

Other ideas and videos here

https://www.google.com/search?q=1996+Toyota+Corolla+1.6+stumbles+on+acceleration

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Start by ensuring routine maintenance is up to date. A stumble during acceleration could have several causes, one of which is worn or faulty spark plugs which should be taken care of during routine maintenance along with visual checks of wiring, connections and vacuum lines.

If this brings no results an obd scanner will have to be used to check for fault codes, live data and suchlike.

P0305 Code - Cylinder #5 Misfire
A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #5.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

Causes: A code P0305 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
- If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

- If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Test, check it and keep us updated.

Sounds like it might be fuel related,,, get some GOOD injector cleaner,, mix generously..run it through two tanks worth.. then change the spark plugs...(the crude it removes gathers on the plugs sometimes!)

A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #5.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0305 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps.

mass air and tps would be 2 most common causes.

Any trouble light? Sounds like it might be misfiring during acceleration which is more related to ignition quality than timing. Check the spark plugs--if badly worn, replace them. Might need new spark plug wiring. Check the air cleaner. Replace the O2 sensor if the truck has a lot of miles. Look for loose or cracked vacuum hoses.

scan check tps sensor.and check.air intake duct leak at throttle body.

Well, I would replace the air filter, make sure the air hose from the air filter to the intake is not kinked or blocked and check for vacuum leaks. If these are all fine, I would check the fuel pressure as it is possible the pump is weak and not supplying enough fuel.

i would check your starter it may be seazing from the cold