Cycle the key from 'RUN' to 'OFF' 10 times just to be sure. It could be a bad RAP module or the fuse to it could be blown. As for the shake, I've had wheel balancers fall off before because the tire place didn't put them on good enough. It could even be a bad belt in the tire or even debris inside the rim. I had snow stuck to the inside of a rim once and it shook like crazy over 45 mph. It couldn't have been more then two ounces of snow.
The jerking could be the crappy knock sensor tuning Ford did with this car. Most of us just unplug the knock sensor. This engine isn't prone to knock. I have my ZX2 boosted at 8 psi with the knock sensor disabled and I get no knock at all. The knock sensor is on the block on the firewall side of the engine. There are only two electrical connectors coming from the block, one is the oil pressure switch (single wire) the other is the knock sensor (two wires). I think the connector for the knock sensor is green as well. Try unplugging it and see if the surge goes away. If it doesn't, it could be a vaccum leak or bad/contaminated MAF.
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1998 Escort ZX2, T3 Super 60 at 8 psi, SCT Xcal2, Cobra MAF, 42#/hr injectors, MSD coil, Ford Racing wires, Ford Racing UDP, Fidanza flywheel, Spec 3 clutch, B&M shifter, Trubendz 2.5" exhaust, 19mm RSB, ES bushing kit, Eibach sportline springs, other goodies....
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