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Seems like you got a fuel pressure issue.Bogs down in 3rd. .Then idle high and low.Also check the MAP sensor its up along the firewall.Make sure the hose and electrical is connected,
1988 model? Does it have a carb or an injector? If carb then please clean the fuel jet/needle. When this is blocked you have a problem like yours. The fuel is coming for idling but when you need more fuel to run the vehicle, it fails to supply.
Your only problem friend, is the temperature sending unit/sensor. Upon cold start, this sensor wil tell the computer to go into cold start mode putting a bit more fuel in and raising the idle a bit to keep it running when cold without using the throttle. Replace that sensor and your good to go. Makes sense, right?
ok if the timing chain was bad it would not run. bogging down is from increased resistance from something. since you have overheating i would guess the water pump broke when you heard the sound. ther is a belt around it and that would cause this. since it idles fine i would wait till it is cold and open the radiator then run the engine and see if you see water moving in the radiator. if nothing after 10 min then i would suspect the water pump. watch that you don't overheat the engine doing this. that would cause other problems that could be more expensive to fix good luck
Make sure that the timing is correct and that the spark from the coil is healthy. Problem can also be with the overdrive in the converter. If it's stuck on it can do that too.
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