1988 Ford F150's check engine light comes on and then it will not idle properly almost to the point of dying. When we run the code it says MAP sensor, we have replaced it 3 different times now and it still does it on and off. What do I need to replace?
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Your check engine light is on because the computer has detected a problem Nathan with your truck. Many things can cause it to come on, therefore, you need to take it to Autozone or Advanced to have it scanned. It is free and they can tell you why the light came on. That way, you know what to change and you won't be guessing.
Check fuel pressure regulator by removing the vacuum hose. If idle does not change or fuel comes out of regulator replace it. Otherwise check your injectors one at a time while car is running. If idle does not change replace it.
There is an idle air control valve that controls the idle rpm, which causes the nice smooth idle. When they go bad, it won't idle, jumping from hi rpms to low enough to cause the car to die. The ones that I've replaced were easy to access and replace, usually on the intake manifold area. This will also give you a check engine light. Beyond this, has the engine had a good tune up lately? To check this correctly you should check fuel pressure coming from the pump, check spark coming from distributor. Good luck. Colin