89 240SX sputtering on acceleration

Thank you I had a feeling that was what we were going to end up doing.

Alright so we went out and checked the other connectors. The one that we had replaced the wire was turned all funny. So my boyfriend turned it back and we started my car and she was running perfect. No sputter when quickly accelerated, no high RPMs, the car was running perfect. So we went for a test drive and after a couple speed bumps a slight sputter started. When we parked the RPMs started going higher and I hit the gas and the car sputter. So my boyfriend checked the wires and the car died down like it was going to stall. So he had me turn the car off and try to turn it back on and now it won't start again. The same symptoms that happened when my old ECU burned out. So now we're wondering what would cause my new ECU to burn out after only being driven a few times after it was put in. Any ideas are greatly appreciated.

Hi, its starting to look like the connectors are a wild goose chase. The car will start and run perfectly fine for a little bit. Then if I turn it off while it's warm it won't start back up. Once the car is cold again it will start again. So now we're trying to figure out where in the fuel system we are having an issue. To top it off a few weeks back before all these problems started I hit a piece of debris in the road and it hit where my catalytic converter is located on my car so now we have that fun task since I can smell rotten eggs when I get my car to go farther then just around the parking lot of my apartments. Thank you for all your help.

My car is doing the same thing I have a 1990 240sx I repleaced the coolent temp sensor and it started fine but it still has the sputter and some times it dies on me it wont go over 4500 rpm's im not getting fuel pressure I repleaced the fuel pump and im getting spark I repleaced all of that

Hi there here's an update as to what's going on with my car. My boyfriend went out and ran my car for 30 minutes just letting it idle. This helped the RPMs to calm down and normal out so he went for a test drive around our complex and had no issues. He even parked and revved the engine and no sputter or dying at all. A couple days later we took my car for a longer drive on the freeway to my moms house. On the way there we stopped and put in more gas because I hadn't needed to fill up in so long the gas was old. That's when he noticed that my fuel reading was staying way high despite opening the cap and driving. On the way home later he noticed a small sputter but after being driven for a few minutes it went away. He unplugged the charcoal canister and the sputter disappeared and the fuel readout stayed normal. All that was left was the random misfire that he has linked to my egr needing to be replaced.