mk4 golf 1.8t problems

[johnnyvr6]

hi i have just picked this up fair cheap,i think the owner was abit optimistic with the power lol,anyway i have noticed the revs go up and down on idle and it feels like its holding back then all of a sudden the power is there more when cold,my old agu feels quicker and that only had a remap,also its quite bad on juice i would say my 4mo golf was better,what do you think could cause this,the link of the car

http://www.swapz.co.uk/swapz/4057251/golf_gti_turbo_agu/

[navmk4gti]

Get it on vagcom..but sounds like maf is gone

[johnnyvr6]

ok cheers I don't have vag com but I'm getting a maxiscan off ebay,I'm also thinking it could be a coolant temp sensor

[davidgtrr34]

I had the same problem and it was the maf

[johnnyvr6]

ok cheers if I unplug the maf and it runs better does that mean it's defo gone before I spend money

[navmk4gti]

Buy a vagcom off ebay and scan it with proper stuff.

Only 6-7 quid

[davidgtrr34]

ok cheers if I unplug the maf and it runs better does that mean it's defo gone before I spend money

not sure but when I unplugged mine I had more power.
also a faulty maf will throw up a load of random fault codes.
I had 7 codes because of it

[johnnyvr6]

ok thanks a lot I will give it a go tomorrow

[Wazzzer]

If it is the coolant sensor unplugging the MAF would also cure that, you need a scan to pin point the problem

[johnnyvr6]

ok cheers will look at changing both