Small surge/hesitation while accelerating
In my 93 I dont think I am getting its full potential. When I accelerate and keep the pedal in the same position, it will accelerate, and then suddently, lets say when I pass 20 mph it will accelerate a little bit more and this gained acceleration power doesn't seem to be lost until I am at a full stop again (or mayby when I get really slow again, <20MPH), because when I accelerate back up again this behavor is repeated after I surpass a certain speed.
Everything else with the engine seems to be fine, I dont think the idle speed varies at all and it hums along at 650 rpm. In terms of a tune-up I did pretty much everything which it entails (o2, pcv, fuel filter, plugs/wires, seafoamed intake). I have done that TPS mod but that was a while ago and it hasn't behaved this way immediately after I did this mod. What are your ideas and what should I be looking at? Im suspecting my EGR valve since its pretty damn dirty and I didn't really clean it well after I put it back in the weekend before (ran out of TB cleaner).
1993 Bonnieville SE "Old Ironsides" 211,xxx mi
Mods: Drilled 180 T-Stat, Carsound Cat, 8mm Beldin wires, NGK-TR55 Plugs, CAI with K&N RX-4750 and ghetto cardboard heatshield, Michelin Harmony tires.
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1996 Bonneville SSEi "Double Trouble" 139,xxx
AC Delco 12-Disc Changer, Drilled 180* T-stat, NGK TR-55.
TBI: K&N RX-4750, Magnaflow Cat, Res, and Muffler