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1990 Ford F150 4.9 ...
 
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1990 Ford F150 4.9 in line 6 cyl.

  

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Hi Scotty, my truck keeps quiting on me. You take it into the shop they you need a MAP sensor or spark plugs. then it will run good for a time, then engine light and runs bad, stops running. it was in the shop 4 times last year. i don't drive it everyday, but i need it when i need it. All i want is for it to run.


2 Answers
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Fuel pump, fuel filter.


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You might want to see if there are any OBD1 diagnostic codes.

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval


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