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I gots a problem! My 91 TTZ is misfiring under boost, but only after I drive her for 10-15 minutes. Also, sometimes the misfiring quits if I drive for 10-15 minutes after it starts. It does not misfire when I rev it in neutral so I cannot pull the coil pack clips to see which cylinder is misfiring. This started after I did a 0-120 pull and one of my vacuum hose plugs came off the back of the balance tube that goes to the air regulator, which I have deleted. When this happened it would not drop below 0psi and I could barely keep it idled. Put the plug back on and it ran fine. The first time I cranked the car after I put the plug back on, I heard a very loud hissing noise, like air escaping, from my clutch pedal, and the car idled very badly and could barley stay on. Eventually it smooths out, but it does this almost every time I crank now. I don't think these are related but they started happening at the same time. Also I cleaned and oiled the filters soon before this started. Video of how it sounds when first cranked. https://www.youtube.com/watch?v=ayvEDGSFBC0
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