I have a 89 camaro 350 while in park engin
revs for a few sec rev back down then on 1990 Chevrolet Camaro

revs back down and shuts off

Asked by for the 1990 Chevrolet Camaro
IF 'stock' Tuned Port Injection (TPI) system, clean throttle body and check for a vacuum leak. Possible idle air control sticking. Injector cleaner with Chevron Techron recommended, if you are going to add any, might as well be something that works, this does!
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2 more answers , 2 more comments
need more
It shuts off but will start agin.
And while driving when letting
off the gas it shuts off
either throttle position sensor of clogged injector in the throttle body. have you ever run injector cleaner. this should be done about every 5-6 tanks of fuel.
Have put injector cleaner in but not that many times
Will try what you suggested Thank you