Replaced rotor cap plugs and wires / was timed and running great for 112 miles turned it off started it up then out of time and misfiring .
SOURCE: hard to start and smell gas
have 1994 4.3 cpi and the problem I had sounds same.
It was a leaky pressure line in pletium . easy fix $45.00 part $15.00 gasket.
the leak was caused from the fuel lines rubbing together in pletium.
take the vortec cover off ,then remove air regulator in middle and look inside . I turned on power to key and gas spray came from drivers side of pletium looking in hole.fuel line side. if gas spray on passanger side then gas regulator faulty. takes 5 min to check
After fixing truck runs runs great. no more gas smell in cab.
also you can smell oil for gas
SOURCE: 1999 chevy suburban misfire
could be one of several things
1) run a compression check, if it low on that cyl then you have a blown head gasket or burnt valve
2) could be the enjector
SOURCE: 1997 chevy truck running rough
Is this a 5.7? They are notorious for intake manifold gasket leaks. When mine did it, the diagnostics blamed it on an ignition misfire also! Replaced the gaskets and it runs smooth!
SOURCE: 2001 Chevy Blazer 2dr 2wd. P0300 multiple misfire,
that smell is a dead give away. your conv. is clogging when it gets hot, and you have a bad oxy sensor. the reason for the converter is the 4door is more popular, so they more relacement parts for it. If you go to your local exhaust shio like we have at home, they can save you a ton on price and parts, and they will make it inspection safe for sure. after you get the work done, make sure you add a can of SEAFOAM to tank, and every 5000 miles to keep emission and fuel parts clean. the ethanol gas is causing terrible problems, and for some reason, especially GM vehiles(they don't know why yet) good luck
Testimonial: "thank u for the help. i really hope this is it causee i dont have the time/ funds for head jobs n injectors or a fuel pressure regulator"
SOURCE: i own a 96 chevy k1500 5.7 l vortec and have a no 5 cyl misfire
It could be a faulty fuel injector, try running a fuel injector cleaner through your fuel system. At worst the poppet nozzle has gone bad and will need to be replaced, you can buy the poppet nozzle it self individually at Auto Zone or buy upgrade MFI system which is much better and less pron to fuel leaking room a cracked poppet line or nozzle which will cause what you have described.
Testimonial: "very helpfull, allthese year i thought i had throttle body as it turns out i have muti port. thanks for the fix."
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