My car has been having the weirdest problems lately. when im accelerating slowly in the low rpms, it will backfire and hesitate really bad but if i floor it, it clears itself up just fine. Any advice?

Also, my rpm gauge has been acting funny. It will sometimes stay in the same spot and other times jump around randomly. Any advice?

The last problem is, when im floored around 4000-4500 rpms, it will just stop accelerating. it feels like it won't let me rev above certain rpm. The other day i was on the freeway in 5th, and it wouldn't let me above 2500 rpms. Any advice?

 

are you flooring it in 5th?

 

yes