I have an 1990 chev sportside with an 305. so far I have added an K&N filter, Throttle body spacer, chip, headers with 2 and a half inch exhaust and a B&M shift kit. The problem I'm having is when I'm at idle in gear for more than say 5min. the idle goes erratic. I just put a new cap,rotor and plugs in, and the wires were brand new last season! I'm running 94 octane fuel and have added another intake tube to the breather assembly for more air! any ideas!