Why is my 1990 GMC 5.0 motor backfiring it's a throttlebody

Asked by Aug 26, 2014 at 08:57 AM about the 1990 GMC Sierra 1500

Question type: Maintenance & Repair

It runs fine for a while and then when
we're out on the highway it starts
cutting out and acting like it's going
to die or get no gas and it backfires

3 Answers


Could be fuel pump going bad,or may all so be igintion control module going bad.

I've changed the fuel pump twice, it still same. It's hard to start backfires, seeme like no gas to the carberstor.

Regina Orcutt

I'm pretty sure it is the fuel line filter right under the driver side door. Please let me know if you try this and if that was a fix or not. Thank you.

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