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my dads 96 ss is hard to start. itll turn over for about 6 or 7 seconds then start. the opti plugs wires fuel regulator fuel pump throttle position sensor have all been replace. still cant figure out the problem. a local mechanic said it could be the injectors bleeding down. how can i check that. the car runs great when its running just takes awhile to start
 

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a local mechanic said it could be the injectors bleeding down. how can i check that.
Method 1:

Hook it to a fuel pressure gauge. Turn the key on, then off. Watch the gauge. If it falls back to 0 within a few minutes, either an injector is leaking or the anti-drainback valve in the tank.

Method 2:

Prior to starting, turn the key on and off several times. The car should now start right away.
 
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