cheers mate,i recon it was the MAF sensor as i disconnected it and it seemed to rev better so got a new one and revs fine now. i have also noticed that when the ignition is turned on the temp guage gose straight to red even when the engine is stod overnight and is definatly cold??? i have replaced the two sensors on the thermostat housing ang the one near it going into th hose and still no difference?is there anything else that i could check and also my spedo is not working any ideas where the sender is located or again what to cheack for? cheers