I have had this truck for about a year and i love it. Never had any problems till now. Since I have owned it i have replaced the plugs, plug wires, air filter and oil filter a few times, pcvalve, fuel filter, belt, fuel pump, battery along with a few other things. I took it about 6 months ago for an emmisions test to get my tags. It failed. Bought new gas cap and took it to a shop to have them test it. Mechanic told me "I hate these trucks the timing is so hard to get right, but this should do it." Still not really sure what he did but i know it was a timing adjustment. He told me to drive it a whille and then have it tested again. So i did and it passed with flying colors. BUT it has been running eraticly since then. After the engine has warmed up I would be going down the highway at about 60 and the revs would shoot up like the engine was cold. Well now it wont start unless i pump on the gas pedal and keep trying. Once started i t runs same as before. Any help here would be much appreciated. Thx Guys!

Any moderators out there that can help. LT. sombody?????

Does it have enough transmission fluid in it... I know when my blazer was low on transmission fluid I'd be driving fast and the revs would go way up and then they'd come back down...

I don't know if it's the same for you but you could at least check that out...

thx ill try that

nope thats not it

cpi/nut kit ... search the blazer forum ...

nope thats not it

How do I know if I have tbi or cpi? also should i get a gasket befoe i remove the phenulm?

buy a manual for your make/model/year of truck. This will be $20 well spent. It will give u the info you need on how to do the cpi/nut kit and any other questions.




How do I know if I have tbi or cpi? also should i get a gasket befoe i remove the phenulm?

Lt mentioned a vacuum leak ill check that before i do anything else. I got a book its tbi. so what should i look for??

search "washing" on blazer forum



Lt mentioned a vacuum leak ill check that before i do anything else. I got a book its tbi. so what should i look for??

thanks everyone ill let you know if this fixs it.

by reading your threads, seems you say you have tbi. if you have a plenum, you have a cpi, or vortec motor. check fuel pressure, if only a bit low, vehicle will eventually start, but have poor driveabilty. with the alcohol in todays gas, if so in your area, i have seen many pumps not performing to par, needing replacement. do yourself a favor, delco only, trust me on that. also if it is a vortec, they also have problems with the "spider injector assembly under the plenum.sometimes, the whole unit needs to be replaced, but, more often than not, a skilled mechanic can change just the regulator, and correct a low pressure situation if this is the problem. if the injectors or seals are leaking, the whole unit must be replaced. something to ponder- jon jonnoboy@aol.com

by reading your threads, seems you say you have tbi. if you have a plenum, you have a cpi, or vortec motor. check fuel pressure, if only a bit low, vehicle will eventually start, but have poor driveabilty. with the alcohol in todays gas, if so in your area, i have seen many pumps not performing to par, needing replacement. do yourself a favor, delco only, trust me on that. also if it is a vortec, they also have problems with the "spider injector assembly under the plenum.sometimes, the whole unit needs to be replaced, but, more often than not, a skilled mechanic can change just the regulator, and correct a low pressure situation if this is the problem. if the injectors or seals are leaking, the whole unit must be replaced. something to ponder- jon jonnoboy@aol.com