Hey guys, I have a 2002 chevy blazer ZR2 Model the problem i am having is with the vechicle jerking and bucking as if its not getting enough fuel. I ran a pressure test and its getting the recommended pressure by factory specs. between 60-66psi. Its at 62psi.Fuel pressure regulator, New fuel pump put in last year. I just changed my ABS Control Module it was shot. I was thinking maybe the speed sensors couldn't determine what speed the vechicle was going maybe causing the vechicle to buck or jerk? OBD wasn't showing any codes. Any help will be appreciated. thanks Scott

 

Could be something as simple as a tune up. Spark plugs, wires, distributor cap, and rotor might have to be changed.

 

Mine was doing it, then I changed spark plugs, and cap and rotor And I runs well. don't get a cheap cap and rotor, ac delco. my cheap one needed replacing after a month, luckily it has a 5 year warranty.

 

Thanks for the feedback, I had a tune up done about 2yrs ago. I guess its that time again.

 

Check in your air box too. Could be something in there blocking air.