Acceleration issue when on drive w/ KA4DE Auto

[xtrmnop]

I baught my 91 240sx LE Auto 8 months ago and it drove ok when I got it but now I'm having issue to get it going. I haven't driven it for months but I do go ahead and start the engine here and there. But now when I put the car in drive it barely goes. It revs and idles fine when parked. I suspect it's the fuel I have in there because it has been the same set of gas since I baught the car.

Things I have done on the car so far:Change fuel fitler, spark plugs, spark plug wires. Air filter and also changed out my maf since I broke my original. Also took of the timing guides for the chain.

I'm at a loss and I'm trying to get it back to working condition to sell. I'm sure it's the fuel but not sure how to go about draining the remaing fuel. Some advise would me much appreciated. Thanks.