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this could be caused by a number of reasons, most common are: dirty fuel or air filter, plugs, distributor cap, spark plugs, spark plug wires or a poor connection in one of the harness plugs, also be sure to inspect there are no wires touching the exhaust manifold, this could cause a live positive to ground out causing hard starting and jerking, it it also a possibility the fuel pump is on its way out. inspect these areas only if the above doesnt help. hope this helps.
If Biggy1 has described it right, I think when you remove the WIRE to the spark plug ( not the plug itself ) and oil jumps out, there is a cylindrical seal that needs replacing and one does not need to even remove the cylinder head. I have the same problem with my corolla. On the other hand if Biggy meant when removing the SPARK PLUG oil was on the contacts....