I have a 96 Blazer that when its cold it sputters or hesitates when shifting. Mostly between 1st and 2nd. Acts as though its cutting out. When its warm its fine. Could it be a vacuum leak somewhere?

 

Numerous reasons could cause this. Is your check engine light coming on? Does it have a steady idle? Vacuum leak would be present at idle usually.


Things to check, proper fuel pressure, clogged fuel/air filter, fuel electrical system, plugs, wires, uneven cylinder head pressure, ignition system, vacuum leaks at throttle body, intake, and brake booster line. as well as all vacumm lines.

 

Ive replaced some vacuum lines,next is plugs,wires,filters. It idles fine and goes down the road fine. Just shifting when cold it sputters. Thanks for the input and I'll see if I can narrow it down

 

Did you ever find out what was causing this issue. I'm having the same problem.

 

A little old of a thread... not sure if op is still around...


edit: just checked to see, and hasn't been on since dec of 15....... so doubt there will be an answer... from op anyways...

 

I have the same problem 2001 Chevy Blazer 4x4 motor sputters going from 1st to second also from 2nd to 3rd gear. We changed almost everything we seen everyone talks about this problem, anyone have any suggestions please you can even call me with suggestions please Mike 732-690-1811