8v losing power then picks up?

[itavaltalainen]

lambda sensor could be dying... did you check in measuring blocks that lambda values still change at a decent speed?

[TEST100]

problem still persists.

ive now flushed the rad,changed expansion tank,added new coolant,and some red x to the fuel tank.
this has seemed to help a bit but its still suffering 

lambda sensor.
surely that would come up on a error code check then,which ive allready done 

[mark-mk3gti]

have you checked to see if the code has come back?

[ImIMK3]

I had the same problem, disconnecting the maf sensor helped. I changed the maf sensor cleared the codes problem solved. Your MAF sensor needs replacing. Also check the braided hose that comes out of the side of the throttle body. If that has leaks then it also causes problems.

[TEST100]

Yh all previous codes have come back up including abs sensor which ive allready changed?when i disconect battery to reset ecu do i have to disconect both + & - so it works?

im planning on changing lambda sensor but not sure wot size i need.?

[g3uvn]

Yh all previous codes have come back up including abs sensor which ive allready changed?when i disconect battery to reset ecu do i have to disconect both + & - so it works?

im planning on changing lambda sensor but not sure wot size i need.?

Physically unplug the ECU in the scuttle tray - at least that's what I did anyway. 3 months of problems were fixed after timing the dizzy and resetting the ECU

[TEST100]

Lambda sensor is changed and problem solved.might hav a look at timing and resetting ecu to see wether it helps anything else.but car is running fine now.

nxt thing is the lower crank wotever it is.it makes a rubbing noise?

[tweed]

Tensioner.  Get some 3 in 1 oil white grease or bearing oil. Spray it in the bearing and see if it goes away.

[itavaltalainen]

resetting ecu to see wether it helps anything else.

It's an urban myth that you can 'reset' ECU by disconnecting battery. Delete fault codes (you obviously have means) and that should be it

[TEST100]

Ive sprayed sone dw40 near bearing before and that gets  rid of noise for bout a day.mayb with proper bearing oil it will last.cheers