I have a 1997 ls 400 with random misfire code, the car sometimes will not start then once it does runs very gas and the exhaust is straight white smoke, smells very strongly of fuel. We have replaced all the spark plugs caps rotors, nothing. Someone told us it was the igniters but that didn't help either. What could our problem be?

SOURCE: random misfire 2000 Safari - All the basic were

there is an issue with the distributor caps you should only use gm caps aftermarkets have been known to cause issues im bullheaded and tried cheapest 1st after 200 in caps i finally bought a gm part which is ac deco it cured it there is a tsb out on this but i cant recall where to find it alldata maybe

SOURCE: Blowing smoke out tailpipes,white to light grey,

your piston ring could be goin bad

SOURCE: Chevy 3500 Express truck. fuel problem?

IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.

SOURCE: Ghost like random misfire. Sometimes it is there

The most common reasons are tired fuel-pump (with Chevys The pump PSI. needs to be 35 or better or the fuel pressure regulator wont work properly) , clogged cat., lack of maintenance (needs air,fuel filter), water in the fuel tank, stretched/loose timing chain. Good luck.

SOURCE: issues with 99 Chevy Blazer LS

check the exhaust manifold possible gasket,check flange gasket or check exhaust system for damage --cat converter smells like rotten eggs or if plugs up stalls vehicle and wont let start-----