GMC Suburban

1990 suburban 350 5.7 weak on hills any suggestions to improve this performance?

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Wiki User
January 11, 2007 3:08AM

a solid tune up plugs,wires,cap,rotor,fuel filter,air filter, pcv valve,have injectors cleaned by a shop.clean throttle body. check timing. see if cats are turning red when you loose power, they might be full.check for vacuum leaks. Good luck.