Means you are burning the wires and plugs, give it a complete tune up, Oil, plugs, wires, or coils, depends on what year yours is, tranny flush and collant flush, i bet it will quit and you will get at least 5-10 better mpg
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timing belt jumped a tooth?,causing burning smell from engine overheating?????????. Out of ignition timing causes erratic/missing/jerking and possibly die. All this " may be " a coincidence from heater core repair.
If you means you press the gas, then for a second it doesnt move, then it jerks into movement, you need to get your transmission checked. If its not that, It could be electrical or you are just pressing on the gas pedal too hard when you go from a stop. If you are say, going 30 and accelerate up to 40, and somewhere in between like say 35, it jerks, you have a SERIOUS transmission problem. Take it to a mechanic and expect to pay $$$$.
What you smell is the convertor working to burn off excessive unburn fuel in the exhaust. That does not mean the cat is bad, but your engine is possibly running too rich on acceleration. If it only happens on real hard acceleration, its normal. If it happens on just normal acceleration then you may have a too rich condition witch will eventually harm the cat. Possible problems are a faulty MAF sensor, partially cloged or internally leaking injector or high fuel pressure. Have it checked by a competant technician if its a constant problem or the check engine light comes on.