CAN'T FIGURE THIS ONE. TAKES FOREVER TO START. WHEN IT CATCHES, CHUGS THEN DIES. CHOKE OR GAS, DON'T MATTER. ONCE IT STARTS, SPITS AND SPUTTERS WITH A LOT OF BACK FIRING. ONCE YOU GET IT MOVING, RUNS LIKE A SCALDED DOG. I HAVE DONE:

NEW PLUG AND WIRE
WENT THRU CARB
DUMPED AND CLEANED GAS TANK
NEW GAS WITH CLEANING ADD
NEW AIR FILTER
NEW FUEL FILTER AND LINES

HELP, I'M DROWNING