Friday night my car started running like crap, it was a gradual progression on the drive home, first I noticed it was sitting in vac at 23-25 vs the normal 20, then a few miles later the idle started to fluctuate when I was off the gas, fast forward a few miles, misfires when I let off the gas from over 2.5k rpms. from there the rest of the ride home consisted of flashing CEL and occasional EPC (all for the misfires I had assumed). I get home, check all boost lines and they were good, all viable vacuume lines, and they also were fine. had a 1/4 tank of gas, last fill up was at exon with 93 (I've always run 93). I pulled the plugs and they were completly black, and while I had just replaced them not too long ago (12k miles) i pulled them and replaced again. car still ran like crap until I took it around the block and red lined it a couple times. Car was running good after that; rand fine all day saturday, CEL was off and no epc where I put about 150 miles on it. come sunday, drive out to breakfast car ran fine, driving home, same issue as friday night but now epc came on and stayed on and I coasted home in limp @ 1.5k rpms...longest 4 miles of my life.
What are the symptoms of bad fuel injectors? I replaced my intake manifold a while back and I had two injectors come out. I used the vw provided kits and replaced the hardware and threw the injectors back in. that was about 15k miles ago.
any input would be great. thanks,