just pulled my 1995 camaro z28 out for the spring and summer had the oil changed and preped to drive was running great parked it friday nite and sat till sunday. when i went to start it i had some trouble but when it started ran fine for about 15 mins and then began to backfire. you can smell gas while its running with a lil bit of black smoke. i can also tell that im not fireing on all cylinders which im sure youve already guessed. its loading up when idling. while driving it smooths out but stilling missing and backfiring with no power. plugs wires and distributor are less then 2 yrs old and less then 15k miles on them. really needing suggestions on were to start on troubleshooting.

 

start with the basics, then work your way up.