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Buick Riviera Questions

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I've just finished upper lower and head gaskets, I'm no pro but I've done a few and always had success. I put water in the radiator and it goes right on the block. Did the block crack? I started it and it blows some smoke so I shut it down hope I can save the gaskets. 2 C notes and I'm back at square one. This is my first post so yell at me if I'm not swearing enough.... Any help would be great.
Oil leaks on parking lot
I have a '98 Riviera with only 75000 miles and is a great car! But when the spring is coming and outside is hot I'm getting angry (because of my car VATS system). The Security light stays ON, I have to wait 3 min to try again. The engine starts. I have no problem with fuel pump, radio, panel lights...everything works well. Sometimes I have to try twice(3 min rest). This week I had a rest 3 min near a gas_station's pump which is not funny.
I suppose that there is a problem with the key contact inside of ignition_cylinder or with the reading of the value (ohm) on the key's chip. Also I'm looking about how to bypass this system. Here we don't have any GM dealer or GM auto_service. I'm trying to solve that on my own or to give an advice to my mechanic what to do.
I'm sure nobody will try to still this car (In this part of Europe is very rare and only a few people love old american cars). Help please!
my riviera cuts out under load runs ok until you give it 1/2 full throttle,have mass sensor,intake air temp,spark plugs
why would my key not be working to unlock doors or trunk? when did finally get in with basic door key, the ignition ket turns but no lights or bell is working. Please help. i dont know where to start
Any idea where to check for the short?
Car will intermittently not start. This is a no crank, no start. Battery IS NOT the problem. Steering column is loose, but that occurred AFTER this issue began. I am assuming it is the Ignition Control Module... but I want to try to verify other possibilities before I start dumping a bunch of money into this car. This used to occur every 3-4 days. Frequency and length of time before starting is increasing. Car runs well.
Had not started and did took to mechanic. Said a harmonic balance problem. Got it to start. after turning off for a while, wouldn't start. Replaced fuel pump and fuel filter and it ran from start. Parked it for 4 hours and tried to start, and it just turned over. Is there a fuel relay switch or could it be a computer problem or another possible problem? Or any other advice of things to check?
When I push the gas it will start to shake sometimes
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