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1990 Ford F-250 Truck Keeps Stalling

Tiny
FIREFIGHTER349
  • MEMBER
  • 1990 FORD F-250
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 76,000 MILES
When the truck starts in park it idles like it should. When you put the truck in drive and decelerate the truck stalls out. The same with reverse, once you decelerate the truck will stall unless you give it gas. Within the last 6 months ive replaced the injectors, fuel filter, fuel pump, and fuel tank. The truck has an egr bypass kit also installed bout 6 months ago. Have any ideas on whats wrong? Theres no check engine light or codes.
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Thursday, June 4th, 2015 AT 2:07 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
First eliminate all vacuum or air leaks in the system (very important)

. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Thursday, June 4th, 2015 AT 3:55 PM

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