1999 Chevy Astro miss fires

Hello,

Do you have the actual code it should be something like P0300 or P0301 - 306. If not your local parts store can pull the codes. Post them here.

Also when was your last tune-up?

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OK,

Here is the code def....

P0300 Random/Multiple Cylinder Misfire Detected

So, first thing I would do is pull a plug or 2 and see what they look like. If they look worn then I would do a tune-up and see if that corrects the problem. 8 out of 10 time is does.

If not other possibilities are....

Vacuum Leaks

Low Cylinder Compression

Weak Fuel Pump and/or Pressure Regulator

For more check out the link below...

https://www.2carpros.com/first_things/why_does_my_engine_run_rough.htm

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Ok, great did that fix the Misfire? If so congrats on the fix.

If not let me know so we can do more diagnosis.

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