performance

Hey guys, roommate got a 1997 tj with the 4.0/5spd combo that didnt run. Read the codes, poked around a bit and got it to run after replacing the distributor and coil. Now it idled smooth but wouldnt accelerate at all or go over about 15mph, backed it into the garage, shut it off and now it wont...

Ok, newbie here.🙋‍♂️ So, I'm one of those guys that used to ask why every five seconds about everything because I'm curious. Its struck once again. I was window shopping for a camshaft, not saying I'm doing one, just curious as to what there is out there for the 4.0. Naturally I checked out...

I bought a 2000 manual 4.0 with this doodad on it. Should I chuck it as I did with the CAI?

i have a 2004 2.4 liter wrangler and my dad drives a 2017 jeep wrangler unlimited and told me that he had a hard time on the hills and so did my mechanic... i wanna say its a 4 cylinder thing but is it supposed to be this extreme? and can the engine handle off roading? if not what can i do to...

Ok I'm bouncing back and fourth here I want to run 33's for now but out of curiosity how would it be as performance wise to put 35's or 36's on a 2.5L 5spd with 4.88 what would my RPM range be with 35's be with 4.88 on flat south tx land