I have just installed a blue Gates timing belt onto my stock evo 6. It has done 55km on the new belt and it feels like i have a sluggish car/loss of power. Could this be to do with the fact the belt is still wearing in since it's a new tight belt?

 

Did you set the timing right?

 

Yes, the timing was set correctly but the issue is more so at idle. The car idles and sounds like it has a misfire like a cough every couple of seconds. Im planning to check the plugs, lines and timing belt tension.

 

The auto-tensioner needs to be put on after the manual tensioner has been tightened. This caused the belt to jump a tooth on the exhaust pulley since as the timing belt wore in, the auto-tensioner couldn't re-tension since the arm was fully extended.

No problems since I re-did the manual tensioner first.