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Had a 1994 S-10 that was all sorts of trouble. Found that the spring in the fuel pressure regulator on the throttle body was rusted and broken. Changed that, changed the fuel injectors, changed the MAP sensor and the throttle position sensor, the knock sensor and I forget what else.
Every thing I changed would make it run better for a while then it'd start running crappy again.
Last thing I changed was the gas cap. Ran perfect after that. Dunno how it ran at all with the fuel pressure regulator not actually regulating.
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