1996 chevy vortex 5.7L new plugs, wires, cap and rotor, o2 sensors, PCV valve, compression good. starts fine, idles fine. accelerates good. Flutters and sputters at cruising speed 2000 to 2100 rpm

Asked by Apr 23, 2015 at 12:24 AM about the 1996 Chevrolet C/K 1500 Silverado Standard Cab SB

Question type: General

When maintaining a steady cruising speed it sputters and flutters at 2000 to 2100 rpm. It stops when accelerate more or coast. Only sputters when trying to hold at a steady speed.

7 Answers

19,225

put in a double dose of cleaner in your gas tank...then drive it...then let me know if that helped.

77,735

The Tahoe I had did the same thing, I got it to go away by filling the fuel with Chevron gas and adding a bottle of Techron fuel system cleaner. It cleared up after a day of driving as I normally do. I then added a bottle every other tank, it didn't start doing this until they made the switch from regular fuel to E10. HTH

I have tried all the fuel additive /injector cleaners........ cleaned the MAF etc.... have driven severval tanks of gas through it with various additives. If you drop it down in low gear it does the sputtering right about the 2000 rpm mark again. New plugs, wires, cap, rotor, PCV valve, compression check, cat checked for clog.....yada yada yada

77,735

Have you pulled the codes, there maybe something in memory that could help track this down. The only other thing I can think of on these is the lower intake manifold gaskets, but they cause a lean surge and pinging on hills. You can test for this by plugging off the PCV intake hose then removing the valve, start the engine and feel for vacuum developing at the PCV valve opening. HTH

19,225

ok, check the fuel pressure,pressure regulator valve, 50lbs to start.Engine running min 58 and it will rise with need/demand, you didnt power flush the injectors.try that .

Thanks guys. I will get back to you. I appreciate your input.

Ok guys. Got the truck running smooth again. After all the new parts that were throwing codes and vacuum checks,fuel pressure checks we replaced the distributor assembly and it's running like a new one again. The gear was really worn. Thanks for all your input and suggestions!

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