juiced2ndgenteg

Just to be clear, IT WAS NOT A VACUUM LEAK! It was because I was using a '91-'94 ISC with a '90 harness. You have to swap the polarity to the "B" ISC coil. The ISC was working backwards, extending when the ecu adds steps instead of contracting. You can either swap pins 6 & 4 at the ISC plug or pins 67 & 68 at the ecu. This is for anyone running a '91-'94 ISC with a '90 harness or visa versa. There isn't much good information out there about idle issues. Since, everyone just repeats the bad info posted about 1g DSM idle issues.