CHEVY HESITATION

1999 Chevrolet Suburban

Tiny

wegs67

November, 29, 2008 AT 9:14 PM

Engine Performance problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic 172000 miles

My Suburban is giving me a some trouble. When starting out down the road everything is great until I hit about 40-45 mph then it starts bucking, or hesitating. This lasts until I hit about 55 mph. If I gun it it won't hesitate. Once I am past 55 it runs out fine. Seems to only be an issue when applying the throttle gradually. I have replaced the plugs and wires, just replaced the starter (was told this issue could be starter related), and have run Berryman B-12 through the fuel system. I am at a loss of what to try next. Sure could use some help.

Thank you

FOUND 2911 RELATED QUESTIONS

3 Answers

Tiny

rjstager

July, 28, 2012 AT 3:32 AM

I am having same issue, mine too is a 1999 chevy suburban, just hit 117k miles. It has random bouts with trouble starting. Hesitates at different speeds. After about 20 mins of driving you will hear and feel a thunk from rear of vehicle.

Tiny

dmccrack

October, 12, 2012 AT 4:10 PM

Trying to solve the same problem. No answers for you, but if you found a solution please share! My question title, if you search for it, is "1998 Chevrolet Suburban My K2500 Chevy 7.4L runs fine cold."

Tiny

cobys68chevy

October, 13, 2012 AT 1:41 AM

SOUNDS LIKE THE T.P.S. THROTTLE POSITION SENSOR IS WEARING OUT.

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