Jerking

Ya Know, I bet gstacey's eyes are are "misting" also!

I've seen gstacey in action before!

During diagnosis, he throws out questions. The question asker ---"ACTUALLY"--- performs a check or test and returns with an answer. Not 2 more questions?

I can sorta relate that sorta questioning, to us maybe asking if your neighbor's car is roadworthy, think he will take you to work?

This is 2car. And that would be a solution!

Most of the time, the requested info, is sorta thrown out there, in an order or sequence, as to QUICKLY and EFFICIENTLY figure out what is wrong.

Assumptions, and bouncing from one possibility to another, generally has you spending $$$ on unnecessary parts and labor, not too mention prolonged down time!

I do not know if he was about to get there, but is your check engine light on? Have you had your codes read. This can be performed at many popular auto parts stores.

If you'll just say "how do you do this, etc", many of us here, can possibly explain or link you to something that might aid you!

Sorry gstacey, for butting in, I'll just kick back now, and watch. And see if the testing and looking get done!

The Medic

When you first stated 'wouldn't crank', I started thinking of the possibilities that would cause stall and no crank(i.E. Hydrolock, no charge). Often times the common misconception lies between the words 'start, crank, and turn over'. Yes this could be a catalytic converter, that would cause sporadic cylinder misfires, low power, and in severe state a 'crank, no start'. Best DIY isolation, remove the oxygen sensor 'before' the catalyst, start and run the vehicle, and re-evaluate the symptoms.

Is there a check engine light on. Have the engine scanned for a possible engine misfire.

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it

Clean out the idle air control valve and EGR and PCV valves and also clean the MAF sensor with an electronic cleaner CRC and see what happens

Have you checked your intake vacuum?

Scan for codes and check fuel pressure with a gauge auto parts rent it