97 E320 really rough idle and backfire at idle.
I got my timing cover resealed and drove the car to the car wash and thank god oil leak was fixed. The car had a mix of 10w and 5w-30 from when the oil light flicked 2days earlier on and I shut down the car and coasted into a gas station. Anyway the car was running great except for the rpm going up and down at idle, which I found was a vacuum leak after I shut the car off in my garage. I noticed my cam advance thing wasnt plugged in all the way so I plugged it in. Then when I restarted the car it was really rough and backfired. I tried unplugging the cam advance thing and it was still the same.
Any ideas?
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