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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: the_legend_1981 on December 18, 2011, 11:14:38 am

Title: hesitation between 1700 and 1900 rpm
Post by: the_legend_1981 on December 18, 2011, 11:14:38 am

tbi. I really only feel it in overdrive going up a little bit of a grade. It cuts out and then goes back to normal. Any ideas? I'm wondering if my timing could be off

Title: Re: hesitation between 1700 and 1900 rpm
Post by: Captkaos on December 24, 2011, 01:51:48 pm

Did you find your answer to this?

Title: Re: hesitation between 1700 and 1900 rpm
Post by: the_legend_1981 on January 03, 2012, 10:38:15 pm

Not yet. It's more between 1500-2000. Maybe objectors are dirty?

Title: Re: hesitation between 1700 and 1900 rpm
Post by: the_legend_1981 on January 03, 2012, 10:58:25 pm

Also idles rough in winter months. Could it be related?

Title: Re: hesitation between 1700 and 1900 rpm
Post by: zieg85 on January 03, 2012, 11:01:27 pm

Check your vacuum lines for cracks.  Your temp sensor could be off some not giving the proper air/fuel mixture.  My $.02

Title: Re: hesitation between 1700 and 1900 rpm
Post by: bd on January 03, 2012, 11:19:03 pm

^ This, and...
1) Check your fuel filter. 
2) If you have a pressure gauge with the correct adaptors, have someone ride with you and monitor your fuel pressure while driving.  Be really careful if you do this - gas in the cab or any fuel leak for that matter can be deadly!
3) Inspect your spark plugs, cap & rotor.
4) When you pull the plug wires off look into the ends of the wires for black soot or green discoloration.
5) A sticking EGR valve can also mimic your symptoms, as well as other things.