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1999 Chevrolet Express 1500 Question: Engine idles either real high or real low speraticlypress gas stalls or hesitant

 

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joetheacguy, 5.7L V8, Reseda, CA, February 28, 2014, 21:31
 Rookie

Code came back catalyst, mass air flow and egr stuck closed.changed mass air, pulled egr and cleaned with throttle body cleaner had alot of carbon but not stuck replaced o2 and now the engine turns over and will only start if I spray carb cleaner in throttle body. What am I missing

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