My isuzu pickup 1992 2.3 has a misfire, i already change the sparkplugs , ignition wiring, ignition rotor , fuel filter, air filter,oxygen sensor and its still has a very small misfire i really need some help .

Thats a good question but no , i havent i recently baught the truck it runs and everything ...sometimes when i start the emgine it smokes and its white smoke that smells like gas i was thinking it could be the carburator..

I really dont know much about it , i just drive the truck and feel a burly small lean when im driving it , also one day i was driving and couldnt go faster than 60 mph the speed start to drop

Google "greg's engine and machine" , left column choose 'technical articles' then choose last link , 'using a vacuum gauge' , You're welcome!

Thanks