[DoctorDex]

Noticed something peculiar today. On initial startup (first ~ 30 seconds) the car doesn't miss if I rev it through the 2600 - 3000 rpm range. Normally it'll pause for a sec. when it gets to 2600, but on cold start up it doesn't do this, whereas on hot start up it will.

This brings me to the next question, what is causing the misfire to fix itself on cold startup?

It could be the extra fuel dumped in by the FPR solenoid, but I doubt it. I'm more inclined to think it is a result of the simultaneous fuel injection (all injectors fire simultaneously with the CAS signal from each cylinder, ie. 3 times per crankshaft revolution). Simultaneous injection also occurs with acceleration enrichment. This would explain why the problem is less noticeable with hard acceleration.

This leads me to believe it is a problem with injector timing. Possible causes could be CAS (leaning away from this one) or trouble with injector valve opening time (? faulty fuel injector resistors or maybe even a weak battery).

Personally, myself I have a _very_ weak battery. I've run it dead one too many times. I think I'm going to finally get around to replacing it. I'm also going to check my fuel injector resistor pack and I'll let you guys know if it makes a difference.