i drive a 1982 el camino with a chevy 350. i was driving down the road and all of a sudden my car cuts out and picks back up...it does this for a bit. so i drive it home call my group of car know it alls and they say check the distributer...after checking i replace the cap, rotor, and coil...still messes up...then i replace the spark plugs but notice im running rich ...so i start using 91 oct. gas ( was using 87 and friend said it would help) ...i put a better intake to add air and adjusted my chock...still messes up but now only cuts out or backfires at 1000 rpms for just what sounds like a sec...just like fine fine fine puuuu fine fine fine....WHATS NEXT...timing?