please help,
i have a 1999 blazer 4.3 litre vortek v6 with 200,000 miles...it is running really rough when taking off...between 15 -25 mph.....cant seem to figure out the problem.
have ruled out the catalytic converter and throttle position sensor....has new plugs, cap and rotor....at a loss as to what to check next...put code reader on it and it is not throwing a code...
any ideas will be greatly appreciated

 

Had same problem and a simple cleaning of the MAF sensor cleared up a multitude of problems.
See my post "Can't get or wont take gas" "Problem solved"

Mudcat

 

thank you...i will try that

 

Give it a try, won't take 30mins; let us know if it does your Blazer as much good as it did mine.

 

Ya know.... that kind of sounds like what mines doing. So I went out and checked the MAF, and its seems to be really clean. Does you blazer seem to do it real bad in reverse? Cause mine has just about no power when backing up.

 

hey you guys are great I have been fighting my 99 blazer for about a month with similar problems cleaning the MAF was the cure. thanks for the info