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Hi all, EJ251 block/EJ25D heads in '98 OBW, 5MT Recent work done in the past year: Plugs (ngk) wires (ngk) Timing belt kit (oem) Timing cam gears (oem) Cleaned and swapped out IACV Swapped out MAF Swapped out TPS New Fuel Pump, Strainer, Filter, Pressure Regulator New OEM Oxygen sensor Compression test cylinders 1-4: 214, 205, 225, 209 (unsure if these numbers are good for a High Compression build, it is consuming some oil. Maybe a half quart to full quart every few months of mostly short trips and some highway) I live in Las Vegas, and the temperatures are now at the usual hot. When city driving during the heat of the day, the engine will idle very low (has approached stalling, entire car shutters/shakes) and will often bob up and down +/- 100 rpm. It seems to be at its worse always when the fuel tank is at or below half-filled. If I use the A/C it helps with the issue because of the idle-up function. I've checked for vacuum leaks with a propane tank, and can't find anything. If I unplug a vacuum line, the engine idles up. Upon startup for the first 5 minutes, the exhaust smells very rich. Should I be looking to test next? The valves are kinda loud, should I do a leak-down test? When I press the accelerator pedal, from 1800 rpm to 2500 rpm, the motor behaves as if it is unbalanced. Anything above 2500, it is smooth and responsive. I am using an air intake from a '96 legacy wagon... is that an issue? Too restrictive? Any help would be appreciated. Greg