[notsmartguy]

It's the Vortec 4.3l, it never throws codes, but occasionally I'll hit the gas and the car will have absolutely no power, the rpms go up but no matter how hard I hit the gas the car has no rate of acceleration. the car never gradually increases speed, it just jerks and then accelerates at high rpms, my keyless entry only works within 3 feet of the vehicle, there's more that i'm not thinking of right now. Like I said everything is only occasional, I've had everything looked at multiple times and all maintainence is done on time or early. Nobody seems to know whats wrong so I thought that the pcm could be bad as a last resort.