1993 Ford F150 Rough Idle

1993 FORD F-150
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MOONDOG641
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1993 Ford F150 V8 Four Wheel Drive Automatic

When the engine is warm, the truck will idle rough. Also with a warm engine and in park, when shifting into drive, engine will stall. It seems to be, that the engine is getting a rich mixture of fuel when it is getting warm, because you can smell the fuel and I am burning through alot of gas. I am thinking it may be a fuel pump or fuel relay problem. Any suggestions on how to tackle this issue.
Thanks
Jan 8, 2010 at 7:28 PM
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RASMATAZ
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On the rich side check and test the following:

Possibilities here: Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
Jan 8, 2010 at 9:55 PM
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