Backfire followed by Poor Running
Thanks all who diagnosed my backfire then poor running problem. After hours of labor in my garage I remove the air intake plenum and injector rails and found the hose Susan from Devek had mentioned. It was a vacuum line that had popped off when the car hiccuped. I reinstalled it and put a clamp on too. Susan mentioned that they had a customer that spun out racing, didn't push in the clutch and turn the motor over backwards and the same hose came off there too. Perhaps this is a "special" 928 pop off valve that gives hours of work to fix. my 88 is running great now. Thanks again to all.
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