Check to ensure that the plugs are torqued in to spec, the wires are completely snapped on and that you didnt put the wrong wires to the wrong plugs. thats for the 3 cyl's problem. as for the smoking, it could be the valve cover gasket because if its leaking, it will drop oil onto the sides of the engine which is way hotter than the oil normally is making it smoke. that would make it smoke out of the hood/eng compartment. if its smoking out of the exhaust pipe, then its probably a different problem
SOURCE: valve cover gasket leaking
When you buy the valve cover set, it will include the spark plug well "O" rings. Simply remove the valve cover and on the underside of the valve cover, you'll see the "O" rings that need replaced and you'll see exactly how the valve cover gasket itself fits.
SOURCE: valve cover gaskets, now it wont run
You need to get the timing checked, did you mark the position of the distributor before you took it off. If not you might be slightly off with the new distrib.
SOURCE: Valve Cover Gasket
the oil was the cause of the misfire, the oil swells the rubber on the plug boots and interferes with the electrical connection from the wire to the plug. when you replace the gasket, remover the plug wires, marking which one went where, and use a spray electrical cleaner to remove the oil. make sure the rubber on the new wires isn't already swelled. before removing the plugs or valve cover, spray brake cleaner down in the holes and use compressed air or shop rags to get the hole shiny clean before removing plugs. remove plugs and clean them too. then reinstall plugs and remove valve cover. when replacing any gasket, use a razor blade on to clean the surfaces well. you can even spray a shop rag with brake clean and wipe it to make sure its clean. clean is important. reinstall cover with new gasket in place and torque bolts... be careful not to overdo it, they are small bolts and overtightening can flatten out gasket and cause more leaks. then just reinstall plug wires and off you go
SOURCE: Chevy Prizm or Toyota Corolla 2000 valve cover
The valve cover gasket isn't hard to change. Oil on the plugs indicates a more serious problem. Smoke from the exhaust would be from rings, rich mixture, worn valve guides. It may be that the engine is overfull (that would show on the stick). Oil loss from a leaking gasket would smoke under the hood and leave oil on the engine and the ground.
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SOURCE: I replaced my head gasket on my 93 sonoma 2.5l
It may just be a dirty MAF sensor, you may want to spray carb cleaner into the intake to clean out. Check also the idle air control valve. IT may also just be dirty. Check for loose vacuum hose. If you can, have a scanner connected to the diagnostic port to see if there are errors. Some shops would let you borrow their scanners.
Maybe the plug you pulled was not firing ? That's why there is oil on it...if it was firing and your oil ring is bad...then you vehicle will continue to smoke while running.....
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