1.8 zetec engine rev's
hi all.
i have just bought a car and it has the 1.8 zetec silvertop fitted,it is all pretty much standard except a back box. problem is whenever i rev the car it seems to bog and splutter and really struggles to rev,if i put the accelerator peddal all the way down it almost sounds like its gunna stall,sound like the ignition has been turned of then it will kick in and rev but its really popy n backfires abit through the range. if i push the peddal down slowley it seems to rev fine. any help would be great as im not farmiliar with these engines iv just been on cvh. cheers