Hade this proble for about a month...., Now im starting to hate it.... Options

[doGGy]

ok, guys, i NEED help

Everything started then i changed my fuel filter. First, in the shop they sad how much dose it cost (50$ for the F****** fuel filter!!!!) so i bout fuel filter from corolla and it is a little bit different then the celica's (difference is that corolla folter dosnt has a tighten bolt at the inlet, it has just a pipe, on with the fuel tube puts on), so i made some modification that new filter fitted well, and took my car for a test drive (car felt MORE alive then ever). BUT then i flored it in the first gear and got my RPM on about 6800 and swithed in the second gear i got HUGE back fire.... At first i was kinda happy That back fire even pushed off my rear can silencer (i hade to look for it in the bushes for a 15 min ), But now almost everytime i flor my car on high RPM i got that f***** back fire then swithing in to secon gear and in to 3 gear... Especialy then weather is cold. Ok i know, that im running RICH thats why i got that back fire, but i tryed to adjust my S-AFC setting, but then i lean a little bit there is no back fire, but my car feels more like laizy. And as you know troble is NOT walking alone there is some other thing that i hade... Then i flor and swith my gear near some 4800 rpm i got somthing like a 1 sec lag, my car just stals and then i get power again, but this only hapens then i swith from 1 to 2 ... What the F this could be, cuz it is starting to get on my nervs... So anyone, make a sugestion.

Thanks