"okay well i did the moose TH fix and it worked fine but i get [censored] gas mileage ..."
Probably not related to the TH fix.
"on top of this i also have bad back fire out the intake ..
i rev the car and let off and BANG ! and if i rev and down shift i get it as im shifting ..."
This was present before the TH fix.
"and the car stumbles a little when given gas little quicker then normal almos tlike its misfireing ,
as well as a gurgle / pop sound out the intake snorkle"
"its loud and i dont knwo whats causeing it ...
any ideas ?"
Running rich.
"is this bad or harmfull ?"
Yes, to the catalytic converters
"fixes ?"
Maybe UIM/LIM cleaning including new fuel regulator, new spark plugs and wires.
Someone else (maybe warmonger or others with custom chips) may want to comment on the custom chip.
