Question about 1999 Chevrolet Astro

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Stumbling at cruising speed on highway

When traveling on a highway at nromal speed, the van will shudder like it's skipping. When you mash the gas it quits and runs fine until you go back to normal driving.

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  • jcardoza81 Aug 09, 2008

    I have a 99 chevy astro with the same problem. I've been driving it for a year like that and now it's running rough at an idle or low rpms any time the engine isn't warmed up. Also the gas mileage is way low (9-10 mpg with AC on and a full load) I had a full tune up done, cleaned the mass air flow sensor... still getting worse. someone suggested the throttle position sensor... any ideas?

  • Anonymous Aug 15, 2008

    I have the same problem with my 98 astro. I don't know what is causing it either, cause i had a full tune up also. another problem is when I go to stop and apply the brake, the idle does not drop down, it's almost like the gas is being pushed while applying the brake.

  • Anonymous Jan 24, 2009

    I had a simillar problem with my 99 chev A. Replaced fuel pump, runs like new.

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My 99 had the same problem and my mechanic found that the honeycomb in the catyletic converter had broken loose and was lodged at the opening of the pipe sideways, limiting the exhast flow. Once I replaced the catyletic converter the problem was solved.

Posted on Jan 03, 2009

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