Previous owner chimes in
There is no CC on the car. Personally, I would start with changing the air cleaner. I know it has to be dirty by now. Yes, seriously. You should also get new air breathers for the valve covers or at least clean them well. Small things, I know, but really, that motor runs so good right now in mostly stock form. It's hard to say to change anything, but I would also say that you might want to switch back to the original ignition controller and coil pack which you should have recieved with the car when you bought it. I've just heard that they were better and even though your engine is running great, it's nice to see those stock (from the actual factory) components installed. My .02 cents.
The motor is certainly in mostly stock form, except for the basic changes already noted, including the adjustable FP regulator with pressure gauge attached to the fuel rail. I was very happy to see those Dyno numbers. It is a great running engine - purrs like it would from the factory and hauls like crazy for what it is. This is really a cool car. So many options, such a great running engine, digital dash, T-tops, perfect interior even when I got it, etc.
You should also have the original injectors too. The stock chip was AWOL when I got the car, but there was a pitbull chip in it, circa 1990 which is to be used only with the original injectors. Honestly, the engine runs much better with the TT chip and 36 Lb injectors and the FP at about 42 PSI, I think (the way it probably sits right this very second).
It's just hard to find these cars in the condition that yours is in these days. It's your car and you should do what you want with it, but I have all of my pictures of what it was and what I was trying to bring it back to and keep it as. Stock looking, but with somewhat better performance. My next door neighbor has an 87 GN with meth injection and big-ass downpipe and big turbo, etc. It hauls ass like crazy - I saw the Dyno sheet, but at what expense? They are known for being FAST cars in stock-ish form and why change it? I just hate when GN owners open their hoods and I see all sorts of funky stuff going on under the hood. It's just not how these cars which are in such nice stock-like condition are meant to be treated. Sorry, I'm a purist to a degree.
Best,
Eric McCann
