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1990 Chevrolet Cavalier Questions

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It does not appear to be leaking from the pan or the coolant hoses and when I say leaking it looks like with dumping a court upside down and pouring out
Go over bump too fast. Car suddenly shakes from 30mph on getting worse the faster. Increase speed and let off, right around 55 I hear a clunking noise for a second. Over a bump, shakes, clunk, gotta be rear shocks, right? Front struts replaced few months ago. Then, go to drive to pick up new shocks and the first time I touch the brakes in lot, the left rear SINKS, bad! When I let of the brake, it pops back up. Doesn't seem to do it when I brake at normal speed though, or its much much less of a squat that I don't notice(Also I being so ginger with it currently, its my only car). Is this the rear shocks? Brakes? Both? Something else?
3.1l engine z24 package
DTC says vss, and O2 reading rich,all known sensors,fuel injector,relays,fuel pump,fuel filter,vacume hoses,electronic firing modual mounted under coil pal replaced,new rebuilt ECM from O'rileys but had to use main control chip out of old ECM.when problem first appeared DTC codes were bad computer and vss,with the injector dripping fuel in,now has fine cone shaped spray pattern; but only runs smooth if throttle is floored for higher speeds,you can see cloud of smoke blow out exhaust momentarily till I let up on throttle
Freeze plug behind bell houseing
dont' work. We checked the fuses (all work) and we replaced the dimmer panel switch and they still dont' work. ANy suggestions? thank you:)
Tell me how to fix it Please
Also bucks (slightly). Someone advised us it could be the catalytic converter... maybe clogged???
My gearshift is freezing and can't change gears when its cold outside, until the car warms up and thaws out. How can I grease the gearbox and shifter cables to keep it from doing that. Before I have to replace another shifter cable.
I need to know the steps i need to take after deasselbling the dash?
dont know which port to use the one near the fire wall or the one connected to the silver canister up front
car dies during idle, have changed spark plugs, iac valve, icm, fuel injectors, clean fuel filter, new vacuum hoses. car will run as long as i give it gas but dies at idle speed, and sometimes backfires through cylinders. sometimes blows blue smoke through tailpipe.
1990 Chevy Corsica 3.1
When I try to start the car it backfires and the starter motor disengages, therefore the car won't start.
The key guy said that the 1990 Chev Cavaliers key assembly was not electrical. Long ago he put graphite and that seemed to work. But recently, not even graphite worked. He said it was not the key mechanism and suggested it might be the battery. I had the battery checked and the battery was good. The parts place guy said that it may be the starter. Does somebody know the correct answer? If you let the car set for a while...such as overnight...it will start. But if you drive a while then turn the engine off..it may or may not start. The key turns and you can hear other electrical stuff, fans turn on....but the car won't crank.
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