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  1. I have had this 1988 Cadillac DeVille Gold Edition for over a year now. It is the 4.5L V8 4D. After about a month of having it, it started having a problem where if I attempt to accelerate passed 45mph it jerks the car so hard it feels like the engine just physically stopped for a split second but then continues. Any time I try to speed up after that it does it, but only 45mph. It does not matter whether it is downhill, uphill, or level. I found a broken vaccum line a while ago and fixed it. I've tried replacing plugs and wires, fuel pump, fuel pump wiring, cleaning injectors, cleaning atomizers(?), tried another ECU and body module, checked fuel pressure with gauge while driving around town, fuel line cleaners. I have even tried different oil and transmission fluid. The error codes do not seem to come back with anything useful according to a chart I printed out. I finally got ahold of the person who sold it to me and he told me he had trouble with the Dimmer switch and believed it was worn and shorting, so I replaced that and it did not help. Also, on some days if I turn the dimmer as bright as it goes the engine either nearly dies, or just shuts off, but no other object in the car drawing power causes it, only the dimmer, not even headlights. I have turned on cruise control, brights, hazards, wipers, dome lights, radio, and moved the seat all at once and the engine did not flinch. I do know the front main seal is seeping a bit. Now here is the weird thing, every time I have replaced a part, including the dimmer switch, the car seems completely fixed for roughly 1-2 weeks, then continues with exactly the same issues. Car only has about 127k miles. I am open to ideas, I know some basic mechanics, but nothing elaborate but do live with mechanically inclined people who cannot figure it out either. I am out a lot so feel free to email me at jssloanva90 @ yahoo .com if you believe you know. Thank you, Desperate Caddy owner on his last leg.