Join Date: Jan 2004
wheel_to_sky is offline
96 blazer 4.3 hesitate on acceleration
ok i have a 96 blazer with a 4.3 TBI. not that it matters, but its a 4x4 and LT package.
i bought it 2-3 weeks ago, so i know next to nothing of the trucks history.
the problem that i am having is........
when i start my truck it idles fine. but when i try to drive i get a big hesitation and it spits and sputters. not all the time, just when trying to drive around town with slow speeds, as i accelerate off a stop sign it will sputter and fall on its face, if i give it more gas it go just fine. after it warms it gets better. (does not go away). i noticed that it shutters some wile having cruse set around 65MPH but as i said if push the gas pedal down more it will go fine.
normal driving its hesitates
flooring it, it does better
idle seems fine.
when i bought the truck it had no problems. i did some maintnence considering i know nothing of the truck
--brakes, rotors, drums, wheel cylinders...etc....
the truck drove perfect for 100 miles. then it started to studder around. i took it to autozone to get scanned, the scanner said random misfire. i then went back to the shop and looked at it. i found that i didnt have the air intake snapped down tight on the throttle body, i bolted it down securly and it no longer leaked, ran great the rest of the day (5 miles....maybe????) the next morning i started it and it was running crappy again ( still idles fine, just hesitates while trying to take off. but once it was warmed up it seemed to do ok, i ran a tank of plus through it and some injector cleaner drove it for a week, ( i live 4 blocks from my shop).
this whole time i got no check engine light, so i took it in to auto zone to have it scanned again. this time i pulled a week MAF signal. so i bought a new MAF ($99). put it on, seemed to do fine, parked the truck the rest of the day, went to drive home 4 hours later, same thing, spittin sputtering, hesitatin..etc.....
any ideas?????? i dont wanna keep buying $100 parts every other day if there not gonna fix the problem.