1994 3000GT base rough idle after plug change

[Sevy]

So I bought a 3000gt, did spark plugs, did not change wires,put back together, now I have an extremely rough idle and I cant get the base drive speed and idle to match, I got the idle set to 1000, but when I put in drive the rpm just falls to about 200 and when floored maxes out at around 1500rpm, my buddy messed with the biss? The one on top of the throttle body, the throttle cable etc, cant get it right, so now I feel all sorts of confused, car ran rough when I got it, so I thought plugs, and they were fouled, and now I'm running rich also... when i opened the plenum, one of the 6 was nice and silver the rest were black.

 

[Joshua Tadich]

Sounds like the wires might be crossed somewhere. Did you try changing the wires also?

 

[Sevy]

Oh yeah checked them all, I now think its fuel, I seafoamed it to clear some of the carbon out, was revving in park/neutral to clear out since well drive wasnt gunna rev over 1500, up 2 7k 5 or 6 times and on the last the car just straight up died and tour sport lights blinked and yeah I got no data logger nor anyone around me so throwing parts getting a new sending unit and new pump (no priming )since it cranks, got spark, compression gunna check later on after I get the new tank and such, it was covered in dirt and rust so may have shorted out, or the ecu is done for, gunna check that over the weekend, the car hadn't been driven in years and hasnt had any miles on it through 4 different owners, also may be a clogged cat.. so many things that cause the issues I'm having