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try to check vacuum leaks, i had the same problem when i installed an oil catch tank. I had some vacuum leaks that would mess with the idle.
Also, i recently had a problem where the car would dip under 500rpm when stopped and i would have to hit the gas to keep it from stalling. It kept getting worse over the week, so i kept it parked and it didn't start up. So, i swapped out the starter and now it gives me no problems. it doesnt drop when idlin' anymore, so does your car have any problems starting up?
