z31 bogs down when sitting at stop
My Z has been acting up recently and I was hoping someone could help me out. First off, its a 1987 300zx Turbo, Automatic, 118,000 miles, fresh timing belt as of 3k miles ago, no mods other than a cone air filter. I know it has an exhaust leak on the manifold that has gotten worse since I purchased the car. It ticks now at the manifold on cylinder one. It has a slightly rough idle when in neutral which fluctuates the RPM's slightly. But, when I sit at a stop when the car is in drive, it'll idle really rough and if I sit long enough, when I accelerate it'll bog down and kind of jolt forward intermittently. It smells of gas when this happens too and my foot is halfway to the floor when I do this. No matter the throttle position it will do this. Then, after a bit of stumbling, it will return to normal and drive fine again. The RPM's become pretty low when I sit at a light too, around 500-650. I ran codes off of the ECU and the only codes it pulled was a lean fuel mixture and "check idle switch circuit". I checked the fuel pump a month or so ago when I had a distributor issue (the rotor bolt fell out) and it was working great. I guess it could've stopped now but I'm not sure since it runs fine any other time. If I idle at neutral, it won't run rough, but sometimes if I sit at a stop in neutral and put it into drive when I go, it still has the jolt-y acceleration problem. This started a couple days ago and has shown none of these signs before. I will include that my transmission is due for a fluid flush and change as it isn't acting the best all of the time so I'm having that done soon. Not sure if that's a culprit but I'll include it anyway. Is this an exhaust leak problem? It's on the passenger side so it's not the turbo side. This is my first car and I've been put into a situation where I'm forced to work on this myself as before it was a 2 person project. If this has been answered elsewhere please let me know, I've looked everywhere, FSM, forums, Hayne's etc and none have had anything as specific as this. I was quoted at 850 dollars to have new gaskets put on due to labor costs. I can't afford that so if it is an exhaust leak I will attempt to do the one side that's leaking myself. I'm at a loss and any info will help.
Thank you for looking,
"It's like a tractor beam of hotness" -Ricky Bobby