My mk4 cabby really bangs/jolts when going over the slightest of bumps and i have to take speed bumps at about 5mph....is the suspension knackered or what else could cause this? thanks in advance!

I know yhis has been asked befor in this forum but i wondered how bigga job it is to remove the iscv on this car 1990 i.6i efi as a mechanic im not. my car is actually going into car mechanics next tuesday as is p155ing oil from every possible place (had a shady venezuelan dodgy dealer/mechanic change the engine 4 monthes ago, as the one he sold me with the car only fired on 3 cylinders!) so now theyve got to take out the engine, gear box, steering etc to sort the gaskets out etc and theyll ch

just some pics up of how i got it, the cars currently about 30% stripped ready for paint at the moment, engine will be coming out in summer for a rebuild as well possibly if not in the winter.   comments welcome!                   plans are to get it resprayed in aqua foam - S2 kit fitted, retrim interior to black leather, service and clean the engine and gearbox and new mohair roof fitted this year, next year it will be getting the underneath treated to and new susp