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I am postive that your problem is the blower motor resister. it is located behind the glove box and Ibeielve it has 4 wires. It would be about $40 i think at a Nissan dealer. very easy to replace. about 6 srews on the glove box and then 2 sr=crews on the rsister.
The most obvious fix is a tune-up..which would include spark plugs, air filter, fuel filter, pcv valve. Other potential problems are coking around throttle plate, vacuum leaks, Timing, water in fuel, clogged exhaust?
Check the large vacuum line coming from your brake booster,In it is a one way valve that stops you from forcing air backwards into the intake.Which is what your problem sounds like.The sudden extra air pushed into the intake severely leans out the motor causing the stumble.Hope this helps?
simply "adding a can"is a good way to end up with non-functional A/C. the typical system has high/low pressure switches that enable/disable the system. you need to be at the correct volume of refrigerant as specified on the sticker under the hood. i recommend using the proper equipment, evacuating, pulling a vacuum, and then refilling the system with the appropriate amount.