i made a thread a couple days ago about my car cutting out after putting in fuel treatment. i got the oil changed today, and one of the air filters was a little loose so i tightened it. but it runs like SHYT! it bogs down and just wont get up and scream like usual, its like the car lost 150hp and feels like im towing a 10,000 pound trailer. it sounds wierd to, its got a really deep exhaust sound. is there something that could cause it to run super rich out of nowhere? cuz thats kinda what it seems like

 

and it idles really rough to, idles like its got a cam in it

 

Are you getting an SES light? Kinda sounds like an opti issue.

 

no theres not any lights at all

 

Was the "fuel treatment" safe for O2 sensors?

 

didnt say anything about that on the bottle, it just said "safe for all gasoline engines" my dad had bought 3 bottles of STP "Gas treatment", put one in my moms 2001 cadillac and one in his 94 silverado. i dont see how the cadillac would fine and mine would mess up! it just seems like theyve gotta be related, cuz it started right after i put that stuff in