All,

Sorry if this has been covered but I cant seem to find an answer. I am new here so MODS if this should be in the engine forum please let me know.

My engine misfires all the time. On initial start it runs okay. Once under load after 3000rpm it shudders and there is no power at all. Under 0 load the car wont rev past 3800rpm.

I have replaced the plugs, wires, Crank Position Sensor, coils, and fuel filter and it is doing the same thing.

The car sat for the winter started about once a month and come spring its been doing this ever since. The codes that I get are misfire on x, y, z cylinders (varies everytime) and I always get the multipul random misfires.

Can anyone help me?

TIA,

Jared