Okay… for a few days I’ve had a weird idle. It almost feels like one cylinder is weak. The car used to idle smooth, 3 days ago it started shaking and the exhaust makes kind of a “putt putt putt putt putt” sound (no leaks, this is from the muffler). If I hold the throttle around ~1500 or so it fluctuates by about 100-200 rpm even though my foot isn’t moving. Any higher and it runs strong. It nearly stalls when the a/c compressor engages too - never did this before.
Changed the plugs yesterday, and it had been running /really/ lean - 1 plug was pretty heavily damaged. I was thinking burnt valve, but I swung it by my mechanic’s today and he blames it on engine mounts of all things (he didn’t do a compression test though), and my throttle cable being too tight.
I’ve changed O2, cap, rotor, plugs, fuel filter, wires…
Think valves being out of adjustment could cause this?