Fuel Injection system
1990 Maxima, 167,000 miles, replaced plugs, wires, distributor cap and rotor, motor stumbles during acceleration, could the fuel injectors be clogged?
did you check the O2 sensors and your vacum lines
I just picked my Nissan Maxima 2000 from the dealer. It had a similar problem - the engine stumbled during acceleration and I was not able to rev it above 3000 rpm. Before going to the dealer, I changed the spark plugs but that did not help. Then a computer diagnostic indicated an improper fuel/air ratio. After a mechanic friend of mine said there could be three culprits: the throttle position sensor, the mass flow sensor and the EGR valve. Unfortunately he lacks the specialized equipment required to tell exactly which of these parts is broken, so I took it to the dealer. The dealer replaced the throttle position sensor and the mass flow sensor and now the car drives like new. Therefore I suggest you check these three parts. If you can get used parts for your car ask a local mechanic to replace all three. If you cannot get used parts, it is probably cheaper to take your car to a dealer or a shop specializing in Japanese cars. I hope this helps
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