Thread: problem and i'm not sure...

sorry to necro this thread, but it's still doing it, and it's every time now. i've had some suggestions from neighbors who think it might be to do with the gas circulation (??) but I don't think that's the problem. The only way I can really describe what's going on it once it gets to around 90 km/h under heavy (not even full now) acceleration it just kind of chugs around...the engine goes and stops and goes and stops and goes and stops. I'm still pretty sure this is a tranny problem, can anyone shed some more light on this? I'm trying to be patient but I'm getting sick of this

Sorry. I appreciate any and all help I can get. The deblabla bit was just that I've done most of the suggested things you do to a used GTP when you get it from the Safely Modding your 3800 Powered Car thread.

Check engine light flashing when it's doing the issue?
What octane of fuel are you using?
What spark plugs did you put in and how long back?
Did you change the plug wires?
Are the #4 or #6 plug wires touching the O2 wiring?
Have you checked for vacuum leaks?

No CEL flashing or solid.
I'm using 94 high octane.
I'm not sure what the plugs are but they are from last November (receipt from seller). I'll see if I can find out.
I think the wires are new as well. Again, I'll try to find out.
From memory, all the plugs are clear from touching anything. I will check!
I haven't checked for vacuum leaks yet but will do so when I get home. I think there might be a little one (just guessing), will let ya know.

Thanks.