Engine Stalling

[klat91384]

1991 Ford F-250 5.0L. Stalling/Surging problem when temperatures are under 35-40 degrees with engine cold while idling. Will stall when temperatures are a little colder. Once engine is warmed up, idles great. Idles great with engine cold during spring/summer/fall when temps are warmer even on startup. The check engine light is not currently on. Had a vacuum leak in the vacuum reservoir about a month ago that I fixed. Was getting EGR and o2 codes due to the vacuum leak but that hasn’t come back on. I have replaced the coolant temp sensor, IAC and the AIC.

 

[O'Rattlecan]

I still suspect a vacuum leak somewhere in the intake, especially if it happens until it warms up.

Ryan

 

[klat91384]

What would be the best way to check for that? I sprayed carb cleaner but didn't do anything.

 

[O'Rattlecan]

Try to pull codes again and see if anything shows up. There can be codes stored without the light coming on.

Ryan