Okay, the cat was gutted a month or so ago, apparently it was clogged even though I saw no symptoms, just did distr. cap rotor and plug wires and autolite 3923s about 2 months ago, at first our mechanic told us replacing the pcm would take care of our problem, so we got a reman unit from solopcms, and 02s were replaced about 6 months ago. I got the 02 codes (apparently there were 3) p0131 p0132 p0138.

 

As far as o2, some trucks only like the NGK type, and alot of people forget about the cam sensor in the distributer. Thats a couple things to think about.

 

Yesterday I finished with the plenum and when I cranked it up to check for leaks it idled perfect and there was no CEL, gonna take it for a test drive today and make sure everything is running properly.

 

P0108= MAP sensor voltage too high, or above max acceptable voltage

 

We've already established this, read my OP

 

K. Here's the scoop! P0108: P1297: P0132: Checked the MAP sensor, checked out good. Switched out the PCM and I get a p0133! New crankshaft sensor, new inductive pick up, new coil, new O2 sensors, and new plugs! Truck runns like a donkey with two broken legs!! I get miss firing, rpm drops off to nothing, exhaust stinks, . It's intermittent! Anybody have any ideas on this one?? I'm running outa things to check!! I cleared the codes, they haven't come back butthe truck is still acting the same!!