Have my 99 OBS with EJ22, 120K on engine, 173k on chassis, Weapon R Dragon Short ram Intake (no CEL over rides needed) new timing belt, plugs & Wires. I've owned it since 140K and done some restorative maintenance on the powertrain (tranny bearing, center diff, CVs, U-joints, back to stock exhaust setup)
When moderately accelerating in any gear from low RPM to high RPM ( 1200- 3200) it hesitates/hiccups until 3200/3400 when it cleans up and picks up steam solidly. Damn near like hitting a powerband on your 2stroke dirtbike! like when a boggy turbo finally overcomes lag and boost kicks in (mind you this thing is not turboed!). ALso it is critical to note I am not changing the throttle position during acceleration, just depressing the pedal to mid throttle and waiting for it to tach up so it will stop hiccuping and get my butt down the road.
No DTCs according to the Innova, timing is on according to spec.
If I drive miss daisy it will accelerate smoothly up through the tach range.
Hypotheses so far:
1) clogged fuel filter
2) fuel pump working on taking a crap
3) clogged injectors
4) gremlins, drunken gremlins