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basically, look over all the lines, very carefully. There are multiple T's that could be cracked or broken. When Harofreak00 and I were working on my car, he knocked the T off, and it stumbled really badly. If one is cracked, it could just be sucking in air under load, which could be a problem. There is little to no load on the engine revving in park.

Ok, all coil packs read .8 (.5-.7) on the primary and 9.12 -9.14 (5k-11k) on the seconday. Car is still throwing the P0300 (random missfire), HP tuners doesn't report a missfire on any cylinder, but shows the P0300. In park, you can rev the car to the rev limiter. It revs easily with no miss. I can ease it up to highway speeds, but if I try to push in into any boost more than about 2lbs, it misses and the SES light flashes at me. It has new plug wires and ngk tr55ixs in it. Needing some help here, not sure what else to do.



Ok, checked the coil packs cold. Primary is .7 (.5 - .7) secondaries are 9.79, 9.79 and 9.41 (5 - 11). Moved the #6 wire away from the O2 sensor wiring. Tested the ignition module. It checks out fine. Could it be something in the boost control path. The car runs strong unless I take the boost to the right side of 0 on the boost gauge. Any past 0 causes it to missfire and fall on it's face. Doing flow testing on the cat tomorrow. I am at a loss here. Checked all the vacuum lines that I could find. Just Seafoamed it, we'll see what that does. Any other ideas would be greatly appreciated.


Don

Sounds like a bad vacuum line, although it would be stumbling all the time, so I'm at a loss. Definitely check all visible lines, and the T's, especially the one under the blower snout.

Finally at long last. Fixed.

After the following:

ECT
Intake manifold gaskets
2 sets of plugs
2 sets of wires
new coil packs

Took it out pushed it from a dead stop to 120 foot on the firewall the whole time. No miss, no stutter nothing. Pulled like it should making between 8 and 9 lbs the whole way. Did it three times.

I may have a starter problem now, but the miss is fixed.

The only thing I have left to work on is the interior lights blowing the fuse. I think that is the passenger visor because the lid is broken and I can replace the fuse and the interior lights will work for a couple of days then the fuse blows again.

The air compressor in the trunk doesn't work when I push the button but the ride leveling system works, you can hear the compressor kick on.

For plugs I went with the autolite xp606, BWD wires and house brand coil packs. Running syntec with the lucas synthetic stabilizer.

Next the plans include a 3.4 modular pulley, CAI, exhaust (magnaflow high flow cat, magnaflow mufflers, resonator gone, and 2 1/2 inch pipe), power log, ceramic crossover, and retune with HP tuners.

What kinda whp should that give me?

Don

Great that you have it fixed but reading all of your posts, I don't have a sense of what fixed the problem. Any ideas?

There were several issues all at once. I believe they were all contributing. I can't really say what caused the miss. I am just glad that it is fixed.


Don