what causes a car to have poor acceleration with no other mechanical problems

A worn engine will have low compression and reduced power. A plugged up catalytic converter or it might just need a tuneup.

Well I went to go get my car with my brother and when we got home he let me pull in the garage first and he said I think I know why your car so slow.i said why,he said come walk bacc here and look in your muffer tip.hhahah shit was like on fire inside but idk....I just said I think is ok if its like that he said fucc no any other suggestions?? And my d4 is flashing and was shifting kinda weird so I have the spare car and I used the tranny Spencer's and Its still shiftin a lil weird so my my bro asked if I checked trañny fluid.if it's full then what I need to do.the tbs light came on to,so I'm going to use all the ones that look better then mine.i want after market exhaust though who can help me out on that one? anything aftermarket for 90-95Acura ledgend I'll do good trades or cash just let me know call or text anytime. 2067129385