Truck revs up and down

Is your check engine light on?

Yes it is.

Lets get the computer scanned at a auto parts store, let me know what code or codes are set before buying any sensors ect. as many times other reasons cause that sensor to get a bad signal from parts connected to it, that has a issue and that means the actual sensor giving a code is not bad (but could be) and those reasons need investigated first.

I got a 34 code. Speed control vac. Or control solenoid circuit.

Speed control is the cruise control, just different name. Speed control solenoid is the servo that pulls the throttle open to maintain set speed. If you do not have cruse control its a B/S code as without the cruse control option all show code 34 as open circuit. If you do have cruse control could be lost vacuum to it(servo), Bad wire connection, swoitch or computer. Otherwise if no cruse control option, I think you may need to start testing, Throttle position sensor, air- filter bad, test fuel pump, dirty injectors, dirty fuel pump, spark plugs and wires, check for vacuum leaks. Test and clean Idle speed control valve/idle air control valve and dirty throttle body remove both and clean with throttle body cleaner and assorted nylon brushes and install new gaskets, May have to reset the TPS test first. Look for bad connection and wires loose or bad, and repair, look for bad vacuum lines ect.

Thanks alot.. Almost all of that is new on my truck. Been replacing things whenever i can just because its all old.. I changed my heads out due to burning oil. No vac leaks as of yet.. Testing everything else so thanks alot for input.

Well after hours of checking everything on my truck cant find nothing wrong besides its still running like shit..