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So I had a remanufactured LT1 dropped in my 95 Trans Am last year. Ran great all winter, I daily drive it. Then the other day while I was driving it lost power and started running rough almost like it was missing. Then it went away and ran fine. It was doing this on off yesterday. But it's getting worse, and today on my way home ran like crap almost the whole time. Even when just idling it will suddenly run rough and vibrate like crazy then for no reason just run normal and smooth again. I'm not getting an SES light and all the gauges are normal. Not seeing any loose plug wires or any wires hitting the headers or anything, when I have it in park and it suddenly starts acting up.

Any ideas on where to start?
 

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I put a new motor in my car, and the MAF made it shake and misfire badly. Replaced it and it's calmer now, but there's still something up. Maybe that could be it?
 
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