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That sounds like your coil pack. The coil to number 1 & 4 may be bad. The other coil, to number 2 & 3 cylinder is good and working.
If it's not the coil, you may have to check the wiring to the coil pack-something is amiss. You could swap the coils around and see if the misfire follows your switch to 2 and 3...
If the above don't get no good results, it's not an ignition problem, then you will need to check compression on number one cylinder. Look for any mechanical problem from low compression. 3 major causes of misfires: gas, spark, or compression.
Misfire could be a number of things: a) spark plugs - change them if used over 15K miles - inspect/regap. b) spark plug wires - change them if over 15K miles - inspect c) ECM (electronic control module) - test with HEI (high energy ignition) tester.
The vibrating tells me that the engine is running on less than its normal
compliment of cylinders - the shaking is produced by the imbalance
caused in the engine by one (or more) cylinder(s) not firing at all.
The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be lit - the code coming from your truck's computer will probably be one or more of: P0300 - Random/Multiple Cylinder misfire detected P0301 - Cylinder 1 misfire detected P0302 - Cylinder 2 misfire detected P0303 - Cylinder 3 misfire detected P0304 - Cylinder 4 misfire detected P0305 - Cylinder 5 misfire detected P0306 - Cylinder 6 misfire detected P0307 - Cylinder 7 misfire detected P0308 - Cylinder 8 misfire detected P0313 - Misfire detected with low fuel
most key cylinders are held in by 1 Phillips screw if you take the plastic apart around the steering wheel you can see it but on the other hand the steering wheel needs to be taken off you can rent the puller from auto zone for a few bucks and same thing the cylinder is held in by 1 Phillips screw good luck
A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked EGR valve / passages Faulty camshaft position sensor 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.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
OBD II 300 Random/Multiple Cylinder Misfire Detected
When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.
Fuel injectors, related wiring, sensors and computer issues Running out of gas, or poor fuel quality Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine Incorrect Fuel Pressure EGR system concerns: leaking EGR valve or restricted ports Base engine concerns: low compression, valve train problems and timing issues Ignition system concerns including, but not limited to: Faulty spark plugs Faulty coil or related wiring Ignition module or related wiring issues Ignition related sensor faults or wiring issues