Closed spark plug gap and hesitation, Timing at 18 BTDC

I left my car at idle for 30 minutes  the other day while testing the horn button, got the plugs fouled and car tended to stall. Pulled out all plugs and found all the spark plugs were carbón fouled and closed at less than .020. Replace all plugs with Brand new NGK BP6ES gapped at .031, took the car for a ride but noticed some hesitation again at low rpms. Could the carburetors pistons be dirty due to the long idling and hence i will need to open them and clean the domes with Carb Cleaner? I am using ATM red fluid as damper oil! I also found out the timing is at 19 BTDC!

Edited November 26, 20159 yr by jalexquijano