My 91 fuel injected escort idles fine but stumbles and pings if i dont ease the throttle up. Once above 2500rpm I can mash it and it works just fine. I can't even accelerate normal or it will kick and buck and want to die unless I let off the gas. TPS is adjusted properly, it now is hard to start so maybe the fuel pressure. If it were the fuel pressure tho why does it work fine at high rpm? This problem just all of a sudden started happening.