Does anybody know if there is a normal frequency vibration in the 2.5L engine under load at 3500 RPM? Every time I hit exactly 3500 RPM it feels like the engine is going to fall off the mounts, however 3450 is smooth as silk, and it pulls through around 4500 RPM and smooth's out
. I have recently tuned up and cleaned up most of the air intake, fuel system, and ignition system. Upon a spark plug review, it looks like something is up with my #1 plug (#2-#4 look good) most likely a dirty fuel injector - quoting a cleaning job right now.
Also showing so so results on a compression check (1-4) 130psi, 130psi, 130psi, 135 psi.
Engine swap is out of the question for now, and this is not my DD so I can take my time trouble shooting problems.