89 Astro starts fine, then stalls.

[Busted 4.3]

I have a 1989 Astro that starts just fine, and idles normally for usually less than a minute, and then starts to bog, and will stall if I don't give it a shot of pedal. This is a used vehicle that I just picked up in this state, so I don't know anything about its history. I would like to know if anyone could suggest a logical plan of attack to figure this one out, or if someone might even have a good guess as to what might be causing this problem. Thanks for any help anyone can provide.

[drparkwood]

Check the EGR valve by pulling it off and seeing if it is gum'd up. Also the O2 sensor could be toast.

[Busted 4.3]

I have tried replacing the EGR valve with another known good one, and it didn't do much for it. I don't want to purchase an O2 sensor to try on speculation. Is there anything else anyone can think of trying before I spend way more money than I have on an O2 sensor. Any help will be greatly appreciated.

[RABarrett]

If the goal is to minimize expenses, a good diagnosis is in order. The first thing to check is to do a scan for codes. Then check the fuel pressure. It should be between 9-13 lbs. Start with that and we'll go from there. Ray

[JohnnyO]

I'd check the fuel filter first.

[ivanc]

I had a similar problem and I had a a Service Engine light. It turned out to be the Engine Temp Sensor which had gone open telling the computer that it was -40 deg. It was dumping in so much gas that the engine would flood and not run.

Ivan

[diggin]

Folks , please take a look at the date of the post you are replying to. This post is 5 years old !!