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