Having problems with your Cars & Trucks ?

I have a 1999 gmc suburban k1500 5.7 vortec it has a throttle body injector it has started to miss at about 4000 rpm runs fine throught the rest of the rpm range it misses no matter the temp i have changed the cap rotor wires plugs are less than 1 year old new coil and high flow air filter can any one help as it stands i can not pass because it pretty much wont accel past the 4000 rpm mark just stays there n misses no problems with idle or reving it up in park or neutral and dose the throttle bo

Posted / edited by AnonymousUser on : 25-05-2020

Answers :

Check the fuel pressure and the fuel filter. You've eliminated the ignition probables.
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