Not running right after timing belt change

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#1
I’ve got a 2016 fiesta st feeling down on power and occasionally the idle gets choppy. Car is making 20 psi of boost but feels sluggish. I don’t have any codes and took it to a mechanic and he found nothing wrong. Had my timing belt rechecked and it was deemed good to go. I did pull the valve covers and vacuum pump etc when doing the timing. Any idea what could be wrong. Not picking up any misfires either.
 


TyphoonFiST

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#4
Have you done a boost leak check? As long as the compression is no more than 10-15% between cylinders it is acceptable.
 


OP
R
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Thread Starter #5
Have you done a boost leak check? As long as the compression is no more than 10-15% between cylinders it is acceptable.
Would boost still hit 25 psi with a leak? Also my short term fuel trim is hitting -25. I think it’s a vacuum leak, could a bypass valve cause this or something under the valve cover?
 




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