Hi – I have a 1990 F150 351W 2wd Lariat. I had a bad thermostat and water temp gauge a couple of weeks ago. I had replaced them and the truck was running ok, but the gas mileage was getting worse. Last Friday I read some posts about resetting the computer so I disconnected the neg cable for 10 min and hooked back up.

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Now the truck runs like crap – idles too low and dead spot while coming off the light. Almost sounds like TPS, but I don’t know why resetting the computer would cause it to go in the crapper. Any EFI genius’s out there? Thanks to anyone who can help!

 

could be just a coincidance that your tps went out try cleaning the iac valve also . also when you clear the computer codes , warm the truck up first then disconnect the battery - reconect and the computer will relearn - when it's warm it will learn faster . sounds funny but it's true.

 

Thanks for the post - I will try tonight and see what they look like -

 

when i reset my computer, i did it while it was warmed up
i drove it for 20 minutes or so @ 50 to 60 mph it ran like a turd most the time after i stopped shut it off and restarted it,

the truck ran great and still does