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#2
02-15-2006, 02:19 PM
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Re: 99 rough start
Could be lots of issues, mine was the fuel pressure regulator. You can test it by pulling off the top vacuum hose off the top of it, if there is gas in there, then its bad.
The FPR is located on the fuel rail on the driver's side of the engine. 
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#3
02-17-2006, 09:44 PM
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Re: 99 rough start
It could also be the fuel filter, when is the last time you had it changed? They should be changed every 50,000km (30,000mi).
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2000 Chevrolet Silverado Regular Cab Short Box 4.3L Vortec - 5 speed Ion Alloy 16x8" chrome wheels Magnaflow Catback Exhaust K&N Intake, Throttle Body Spacer  GM Automotive Technician Previously - 2003 Chevrolet Cavalier
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#4
03-02-2006, 02:38 PM
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Re: 99 rough start
My 98 4.3L was doing the similar thing when it was damp outside until finally it just wouldnt start on a rainy day. it ended up being the coil.
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