I have a 7229 before compliant stop F engne mower. With no spark I added a new low price coil from compliant stop ( ground to stop ) and remarked the off switch terminal to ON. It starts and is slow to rev up on the 1st or 2nd pull. As it runs and it pops or fires out the exhaust . The ports are clear the muffler can be blown thru with air hose. The carb is clean. Is the new coil timed late? upside down? Or some other problem like the low gas level in tank 1/4" Or what?