Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: why my mustang will idler proper on 1990 Ford Mustang GT

at first start up
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
The 1990 Mustang engine idles properly due to electronic fuel control. Prior to the computer controlled fuel systems, engines relied on mechanical chokes and adjustable screws to set idle speed and air fuel ratios at idle. These mechanical systems were temperamental at best and often caused improper, rough, fast, slow, or erratic idle.
Didn't find what you were looking for?