Runs perfect for 10s then rough

Scottyb01

New member
Joined
Dec 12, 2019
Location
Australia
TDI
Golf 1.9 MK5 Manual
Hey folks.
Will get a scan from a Vcds soon but what would cause a 2.0 PD bkd engine to start and run puuuurfect then I hear a valve click or something click and then it runs like only two injectors are working. Then after a minute it’s fine but the accelerator pedal is now inactive.
I have just swapped the engine from a 1.9 pd to a 2.0 pd with correct harness.
Scott
 
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