Thx for all the reply guy appericiate very much for the answer .this is how it happen.I have replaced 2 of the before cat o2 sensor .after replaced them they idle very smooth ,dirve it for 50km CEL came back on again ,than i reset CEL ,drive it again for about 50KM back on again CEL P-1128,P-1130 ,at first i don't know where is the MAF locate at therwise i should check it at the first place.than i found where the MAF is ,so i have disconnect the wire and the batt back after a minutes and start the car ,start very will no rough idle from 1000-5000 RPM very responsive no problem on idle.So now put back the MAF wire back in start the car very rough idle i have try this repeatly with no luck ,so than i have also try cleaning it with electrical wire cleaner twice and air blow it no luck again .this is a 97 boxster ,i have no way of knowing has the previous owner have change it .I doubt it .for the very last time i have try again unplug the wire and back on again ,to my kknowledge it sound like the MAF .But i wand u guy who been throught this with more experiance with this problem ,please guide me throught it .could this be other problem given the wrong signal to MAF? or with this symtom i have mantion definate be the MAF
