Hesitation with 95 Chevy S-10 Blazer

I have a 95 Chevy s-10 blazer with a high-rpm hesitation problem. It runs great below 3k rpms but above it seems to loose all power and hesitate (jerk back and forth. The dealership supposedly did a complete tune up 20k miles ago. Yestday the "check engine light" went on after a 45 minute drive. Today, I did stuff around town and it was fine. Still, have the high RPM hesitation though. Any one have any ideas?

"Tune-up"? When was the last time the fuel filter was changed?

Just changed the fuel famously filter when this problems started. Didn`t do frantically plugs, cap or wires yet. To a higher degree that`s next....though all that was done 20k miles ago so can`t deadly see how these parts deteriorated that far that quickly.

definitly try the fuel appreciably filter again, my friend has a 97 with the same prolbem, check engine similarly light & all, oddly enough changing the filter mad the hesitation & the light go away

Did they replace the spark-plug wires? Check that your wires are properly seated on the plugs and distributor. If all seems fine check the impedance of your wires - perhaps they damaged or bent a connector by being too rough with them.

Just an FYI so it it can help people in the future. I finally took my blazer into the shop...the mechanic ran through the diagnostic tree....couldn`t find anything until the very end, when he checked feul flow...which was fine...then checked feul pressure and while checking feul pressure he bled out some of the feul...and all of a sudden, after that, all symptoms disappeared. My Blazer now runs great and goes up the hill to my house at exactly twice the speed it would before. Both of us don`t know what it was but somehow bleeding feul out resolved the symptom.

maybe you had an obstruction in the fuel line and bleeding it off unblocked it