Hey guys
I've got 1995 5.0 GT. I've had it for 2 years and it's always had a bit of a rough idle, but it's gotten progressively worse. When I say rough idle I mean that when I start it the RPMs rev up to about 1200, then drop to 1000, then drop to about 750. It then proceeds to repeat this process several times before finally settling at an idle around 750, but it doesn't really settle, every few seconds in kinda rumbles and then drops to about 600 RPMs before jumping back up to 750. It also does this little jump every time I put I take it out of park to change it to another gear, and it will do it continually anytime the car is stopped and idling. Also, every once in a while when the engine's cold and I've left home, the first stop sign I come to the engine tries to die, the RPMs drop to almost nothing, but if I hit the gas hard and fast enough she'll keep going. I'm thinking the problem is my IAC but I would love to hear any ideas you guys might have, or if anyone else has had this problem with their stang. I also tried to test the IAC by unplugging it, but even with the engine warm, the engine started and then completely died... don't know if that's normal?
I also made a list of possible causes that have already been dealt with so you guys know what I've already fixed
Vacuum Leaks
Air filter
Dirty throttle body
Ignition timing
I've got 1995 5.0 GT. I've had it for 2 years and it's always had a bit of a rough idle, but it's gotten progressively worse. When I say rough idle I mean that when I start it the RPMs rev up to about 1200, then drop to 1000, then drop to about 750. It then proceeds to repeat this process several times before finally settling at an idle around 750, but it doesn't really settle, every few seconds in kinda rumbles and then drops to about 600 RPMs before jumping back up to 750. It also does this little jump every time I put I take it out of park to change it to another gear, and it will do it continually anytime the car is stopped and idling. Also, every once in a while when the engine's cold and I've left home, the first stop sign I come to the engine tries to die, the RPMs drop to almost nothing, but if I hit the gas hard and fast enough she'll keep going. I'm thinking the problem is my IAC but I would love to hear any ideas you guys might have, or if anyone else has had this problem with their stang. I also tried to test the IAC by unplugging it, but even with the engine warm, the engine started and then completely died... don't know if that's normal?
I also made a list of possible causes that have already been dealt with so you guys know what I've already fixed
Vacuum Leaks
Air filter
Dirty throttle body
Ignition timing