Hello,

My Mazda Pickup misfires after I accelerate. If I accelerate too hard in first or second gear, she will stall. This happens when the engine is cold. I can warm her up for 30 minutes and she will still misfire.

This symptom goes away after a bit of driving around the block, but idling still seems a little rough.

Eventually I do get a code from the computer for a misfire in the first cylinder.

Here is a list of what has been done to my Mazda:

Remanufactured Ford Motor

Motorcraft Ignition coils and spark plugs

Rebuilt Ford fuel injectors 

New fuel pump, fuel pressure regulator, fuel filter

New carbon canister, purge valve

New EGR valve, solenoid, sensor

Delphi Idle air control valve, 

Motorcraft throttle body position sensor 

Air temperature sensor

Delphi MAS sensor

Refurbished Ford computer 

NGK camshaft and crankshaft sensors

Delphi O2 sensors

Cylinder comparison test, leak down test

smoke test for vacuum leaks

electrical trouble shooting and testing grounds

  :envy:  

Any ideas?

Thank you,

Thomas Mello

I love my truck, even though she doesn't love me back.