What is wrong with my 1988 buick Regal?

It started choking like if there was water in the gas then got worst to where it was back firing. I put fuel treatment in. Now it just clunks and won't start. It blew out a big cloud of smoke. It's a 1988 buick regal limited 2.8 V6. Anyone have a clue?What is wrong with my 1988 buick Regal?Sounds like a timing gear or chain. I am not sure which your engine uses. I would get it checked out, but thisis often fatal to the engine. you may need to be shopping for another car because the expense of repair will exceed the value of the car.What is wrong with my 1988 buick Regal?
try added this stuff called sea foam the the oil and gas let sit and then try to strat and maybe some dry gasWhat is wrong with my 1988 buick Regal?check the oil and antifreeze. those engines have a problem with the intake manifold gaskets and head gaskets leaking. water in the cylinders will cause all kinds of problems.What is wrong with my 1988 buick Regal?
install a new fuel filter, then try again, you said backfire from the carburatoror or the tail pipe? oh and try cleaning the throttle body and the I.A.C. valve, just make sure you dont pull on the little umbrella type looking rod, if the rod is all the way out then its no good, use a toothbrush and about 3 cans throttle body cleaner. gd lk.What is wrong with my 1988 buick Regal?Have someone help you and Try to Drain Some Fuel "From the Bottom" of the Tank into a Large Jar and let it sit "Covered" for a while, if there is water you'll see it Separates from the Fuel! Change the Fuel Filter. Check Fuel Pressure at the Fuel Pump, Check Timing and Timing Belt/Chain, Lastly Check for Damage that may have happened to the Plugs because of the Excess Fuel %26amp; Backfire. NOTE; If it is water go to the Station where you got fuel just before this Happened and let them know that you might be taking them to Small Clams Court.