Sure sounds like the Opti or valves, is the car throwing codes? Is this happening right after the cam was installed? If so then you want to double check your plug wires. The car will semi-run if two wires are crossed.
What are the specs on the cam? And you didn't mention if you have had it tuned?
A cam like the Hotcam or 305 will run with the stock tune, but if you have something larger it will have issues.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
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