97 1500 INtermittant no start and PCM codes

[mlw35405]

Please help. I am a Ford guy, but someone gave me this GMC 1500, 4.3 V-6, 4L60E auto, and a big headache. So if anyone can give me any pointers on any of these problems, I would greatly appreciate it.

I had the tranny replaced last month because of no overdrive or 1st gear. Now tranny shifts great, but two weeks later my PRND321 indicator quit working.

Last week the truck wouldn't start after a short drive. Turning the key, it was like nothing happened, no cranking or anything. Replaced starter, no help. Will start normally when cold. I removed the cover on the starter relay, and if the truck won't start, I can touch the relay contacts together and it will turn over and start right up (replaced relay, by the way). was thinking maybe ignition switch, but wanted to be sure (the darn thing costs 110 bucks).

Intermittant miss when cruising, MIL codes for Camshaft position sensor circuit low input and Mass air flow sensor low voltage. Replaced the Cam sensor and erased the codes, but they both came right back (still missing, maybe one poot a minute). Could the MAF sensor cause both of these codes? It too is over 100 bucks, and I want to be sure I'm not missing anything before replacing it.

Any suggestions on any of these would be greatly appreciated. I don't know if they are all related or not, but they are all a pain in the butt! Thanks!

[ashaus]

Could be the ignition control module might be heating up and breaking down inside. Remove it and take it to a reputable parts supplier. They will run a test on it that puts it through its paces. This will save you from spending @ $100 for no good reason.