My 99 Jeep grand cherokee has developed a constant high idle, when in park it idles around 2000rpm, in drive it idles near 1500rpm. it has error code 0505 which is iac valve. Replaced the iac valve with a mopar one. Still doing it. it has been like this for about a month. no vacuum leaks, checked over all the wiring and no breaks anywhere. But now, all of a sudden since it started getting warmer outside, when the vehicle gets to optimal temperature, it stalls, and wont start. I figure crankshaft sensor. but could all the problems be related to a faulty pcm? how would i know? im really short on cash but need the vehicle.
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