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My son has his 3.4- 93 camaro, when running in the driveway, I can smell fuel, The car runs and you can drive it. I was wondering if the sensors are bad causing to much fuel to be dumped into the fuel system, the car will almost lunge while driving it. Like it is getting and not getting fuel,maybe vacuum leak, any ideas will be helpful, I have replaced both head gaskets recently and car ran perfect till now. Have changed fuel filter and will check fuel pump or replace it next, Thank you in advance................Dan
 

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Find the fuel pressure regulator and pull off the vacuum line. See if fuel dribbles out. Sounds like the diaphram may be ruptured.
 
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