whats going on with my 1993 GMC sonoma 4.3liter ?

lazzymeader

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Nov 26, 2008
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I just bought this truck it had plenty of power 2 weeks ago.Now the motor is losing power but it runs smooth.
It seems like when i run the AC the motor starts running
a little warm shifts the auto tranny from 1st to 2nd harder
than before.I put a new thermostat,waterpump,water sending unit,fuel filter checked pvc valve.
Any ideas on other things to check?
 


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