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Hello everyone.i have chevy s10blazer 2.8v6 1986 tbi carburator ,i have 2 problems with my chevy.first when i want to start engine it cranks and then it starts .and second rpm is high 2500 when i put in D or R it goes 2000.i have changed the fuel pump .fuel pressure regulator all new .nothing just same problem, any advice
 

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Squid Life
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100% agree with the vacuum leak and I would suggest you test the Throttle Position Sensor and the Idle Air Controller if you cannot locate a leak.
 
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