jeep yj backfiring when shuting off
So i ve been having a problem with my 87 2.5 yj backfiring after i shut it off. It seems to just backfire not sputter. I replaced all the vacuum lines, spark plugs,plug wires,fuel filter,new muffler no cat co verter, and also replaced exaust manifold.
So after most of this my idle went from 1500 to around a 1000 or 1200 which is still very high. It idles at 900 when cold but warms up to the others rpms i just said. So before i had back fire everyonces in awhile. I just replaced my 02 sensor now it back fires everytime i turn off the yj which is annoying and scares ppl around me. Its been 3000 miles since the exaust manifold swap and fix. It does sound like i have a exaust manifokd leak again which would suck since i paid someone else to do it. Do i need to reset ecm for the new 02 sensor all i did was disconnect battery for 20 mins. Ill get a video of it soon running and how it sounds.
87 YJ 2.5 inch lift 1 inch shackle BF AT 33-1250-r15
09 WK Hemi, 2.5 inch Rc lift, Super chips,Gibson 3 inch catback, rough country spacers, Voolant Cai,lockpik, Falken Wild peak At 265/70R-18