87 f150 6cyl,4 speed,starts fine but rpm will surge and stall until warmed up and then run fine,any suggestions,thanks.

Asked by Oct 22, 2013 at 06:14 AM about the 1987 Ford F-150 STD Standard Cab SB

Question type: Maintenance & Repair

87 f150 6cyl,4 speed 130,000miles,starts fine but rpm will surge up and down till stalls,restarts fine will run keeping idle up until warms up then no problems,any suggestions,thanks

4 Answers

22,760

Hummmmmmmmm. Sounds like a problem I use to encounter when I owned vehicles manufacturered in the 50 and 60's. Usually a carburator rebuild would fix it. Today, even lawnmowers encounter the same problem. A twenve buck kit from the local lawnmower repair shop usually fixes the problem. Is the vehicle carburated?

22,760

Really sounds like a problem with the old style automatic choke on older vehicles.

I would agree with you except it is EFI,no carb.

22,760

Does the vehicle have an IAC motor? It open and closes the ports adjusting the idle. Could be a heat/electrical issue. I'm really more at home with vehicles built two generations ago. My hair was darker also.

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