Could wear many hats.Try process of elimation.
check out the cataltic convertor.When they go out, Loss of power, after
shuting off, hard starting.running hot. odor.
What happens to one's converters the inside looks like a scale-down
version of a honey bee's nest.The inside is all tiny Honeycomb.using a
lot of bad gas, along with meththanol, alcohol,causes the tiny cones to
begin melting, this will clog up the converter.causing the exhaust no
way to escape.Engine not breathing properly will cause your problem.