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Originally Posted by A26B
I'm a little confused with the "short runner intake." What exactly is that?
Your problem, being intermittent and worsening, sounds to me like an electrical issue. Loose connection, bad ground(s) or open/short in the harness. Part of it sound like it's restricted to closed loop except that once you reach 5000rpm it craps out again. If it were O2 sensors, you should have a code, same as with any other sensor.
I'm leaning towards a bent pin on the ignition module (easy to do) or bad ground(s). If you could data log, you might be able to chase it down.
If you have acess to another known good ECM, I would suggest trying that too.
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I agree on the ECM - if it's flakey there's no telling what weirdness
can occur. You might not be able to log data either.
I fought with similar problems on my wife's L98 a few
years ago. That one would throw random SES codes which made
think it was a bad ground or related connector problems. Ran like
new with a good ECM.
Glenn
91-1341 and 91-9405