Td5 experts please.

Hey everyone i need some advice as i am a little stumped. I have a Td5 discovery and it is guttless as hell i have a chip on it aswell. i drove a customers discovery 2 this morning and it had far more power than mine. I have psi power box chip, itg airfilter and yes it is clean. and a blanked egr. It just has totally no go until 2000rpm and to be knonest it doesnt seen to be exactly powerfull their on after. I dont expect a racing car but its kind of anoying when you drive a standard one and mine feels less powerfull. when ive spent money to improve it. I do have 265/75/16 tyres but i dont think that they would cause it to be as it is. Please help me as its rearly anoying any ideas appreciated. Dan

have you had the ecu read? are you sure it's not in limp home mode?

Ive had it on t4 at work and found nothing. thats why im confused. Dan

what did the MAF read? it should be about 55, if it's reading around 35, ditch it and get a new one.