hi I have. a 91 camaro rs 305 auto the issue is. when I reconnect the. base timing plug it stall in gear and at idle it rough but if I leav the base timing unplug. it runs. fine... things I have donw distributor cap and rotor botton spark plugs gas filter o2 senor tbi clean. and iac. and new tps and. and new tepm sensor any ideas of what is. please let me know thank you