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If the person placed the cleaner in the gas, It is possible the cleaner has fowled a spark plug by loosening residue inside your engine and depositing it on your spark plugs. I would begin by removing plugs and cleaning or replacing them depending on the age of them. If he placed cleaner into the oil, you will have to change your oil and filter because the cleaner loosens stuck on deposits inside your engine and could clog the oil filter. After cleaning plugs, it would be a good idea also after cleaning plugs, to reset your cars computer. This can be done by disconnecting a battery cable for a bit, but it probably will reset all your radio stations also. Examine the spark plugs as you remove them. The electrode should be a tan color and the ring base should be a dark color or a little black. There should be no build up of deposits enough to cause a misfire.
Replace the plug wires and plugs and inspect the old parts for cracks and corrosion(wires) and carbon deposits(plugs). Inspecting the air filter (replace if necessary) and replacing the fuel filter may help also.
Hi it could just be the oil pressure switch get that checked first.
Is the car putting out any smoke? if so then it may be the head gasket starting to go, leaking oil into the pots. give it a hard rev and check, also the valve stem oil seals could be going. this would cause the engine to run rough if the spark plugs are getting oil on them. remove each plug and check for deposits of oil or very dark carbon
there is a few possibilities but your better checking these first.
if no joy get back to me
This could be a TPC valve or sensor. That is a throtel position control. Your engine will idle or run at low speed fine or in stop and go traffic but highway driving or climbing a hill when the demand changes to heavy or light consumption it will surge the engine as it can't get a good read on what it is suppose to do. This is a resonable priced part and for about twenty bucks for a CHILTON manuel for your car it will give you step by step instructions on this and almost any project you want to try yourself. They will have these at your autoparts store.