White smoke is usually do to water in your system. That happens when you blow a head gasket, or have a cracked head. If your oil level is high check your oil for water, if so that's were your coolant is going. All in all you have a blown head gasket.
3 misses on the same height causes you to be out of the competition.
check your egr that is not plugged also do you have any engine codes?
If your Chevy 350 marine engine misses at high speed, you might have an issue with the timing. This can be adjusted. You also may have an issue with the fuel filter or injectors. Spark plugs can do that also.
u might have a vaccum line loose
A 2000 Silverado 5.3 Vortec that is hard to start and misses on one side of the engine might have a problem with the coil pack or the spark plugs. It could also mean that the block is cracked if the engine is prone to overheating.
I can't help you with the rough engine. Maybe someone else can. The coolant light is one of many tiny little engineering things with the Cougar1 ('99-'00), though this problem might also affect the Cougar2 ('01-'02) but I don't know if that was changed, which don't work right on all units. The problem is a faulty sensor that throws out a low level warning before the coolant drops below the MAX line, let alone the MIN line. You can safely top the reservoir off to about an inch over the MAX line without risking a spill as the reservoir fills due to coolant expansion.
Check the coolant temp sensor. The one for the computer not the guage if so equipped
engine misses could be bad plugs,incorrect ignition timing, cracked distributor cap, bad wires, vacuum leak, clogged fuel injector or filter, . engine backfires could be ignition timming, vacuum leak, EGR system not working, bad valves or valve springs.
Misses is correct.
Your distributer or your coil
rings are burned and there is only enough compression to run the engine without load.
If the engine on the Santa Fe is missing, then the cruise control will not operate properly. The engine will have to run properly before the cruise can be fixed.