What makes the DFI light come on but the engine still runs but seems to run slow

could be sensor of some sort.I would check all the vitals on the cat,being sure all fluids are good.

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manual works fine .

Hey Destry,
What makes you think its trying to run backwards...?? On a 4-stroke - this is odd!! .... I don't think a 4 stroke will run backwards!!.. (But, I have actually seen a two-cycle engine run backwards.... just retard the timing to zero).
1. Have you changed the spark plug?
2. Have you had the carb cleaned and set by a professional
3. Have you put in a new air filter.
4. Have you had the timing checked..(with a timing light)
If the engine actually runs backwards it will cause engine damage.. all the moving parts are designed, clearances are set, and fuel/air intake and cam timing are all designed for the engine to turn in one direction,,, when it does turn backwards, the valve train clearances are taken up and sometimes the valves will hit the pistons...(on a V-8 the cam chain controls all this..its "slack" only works correctly in one direction).. Please do 1 through 4 and repost with the results, Thank yoe

fuel flow to the carb is slow. fills the bowl, runs till its dry. pause while it refills slowly, repeat.

check to make sure diaphragm in carb is good

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your engine is idling to fast
slow down the idle

I assume engine is still running but losing drive. Simplest thing is
belt has worn.

If you have a vent hose coming out of your gas cap make sure it is not kinked. A kink in the hose will cause a vacuum in the gas tank and very slow gas delivery to engine, which would become apparent at higher engine rpms including after warm-up.