[mwebb]

Originally Posted by Daox

19" pretty steady. There was a tiny bit of flutter, went between 19" - 19.25".

a wee bit on the low side
but good enough to confirm that the CAM and Crankshaft are in proper alignment and

.25" of flutter is a show stopper
is that with the engine at hot idle ? if yes , you have a leaking engine valve OR
the PURGE valve is operating while you are taking the measurement
so
put your finger on the PURGE valve , if it is ticking in time with the flutter
ok , disconnect it (the Purge Valve electrical connector only ) and repeat to see if the flutter is gone , if not

you will need to do a LEAK DOWN TEST on each cylinder in turn
a COMPRESSION test might not find this
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and
if possible , it would help if you could provide Long term fuel Trim at hot idle and hot 3k rpm , the generic tool like a scangauge2 can do this