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Idles irradically... sometimes just dies... runs great and…

Customer Question
Idles irradically... sometimes just...

Idles irradically... sometimes just dies... runs great and then all of a sudden starts chugging... then runs perfect for a bit... then chugs???

Mechanic's Assistant: How many miles are on the car? What size is the engine?

136k 5.0 ltr

Mechanic's Assistant: What is the model/year of your Ford?

1992 f150 lariat

Mechanic's Assistant: Are you fixing your F150 yourself? What have you tried so far?

Don't know where to start

Submitted: 8 months ago.Category: Ford
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Answered in 2 minutes by:
9/14/2017
Ford Mechanic: Mike V., Auto Service Technician replied 8 months ago
Mike V.
Mike V., Auto Service Technician
Category: Ford
Satisfied Customers: 27,027
Experience: 25 years experience on all makes and models, Licensed NYS Inspector.
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Ford Mechanic: Mike V., Auto Service Technician replied 8 months ago

Is this only happening at idle or even when you are driving?

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Customer reply replied 8 months ago
when im driving
Ford Mechanic: Mike V., Auto Service Technician replied 8 months ago

Ok

I would try unplugging the mass air flow sensor and then start it and take it for a drive. If it runs better, then replace the sensor. If not, then you may have an egr valve sticking open or an issue with the catalytic converter plugging up. If the substrate is loose or broken up in there, it might be blocking off the exhaust causing some back pressure which would result in the engine running poorly. These are the areas I would start with.

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