92 Buick- weird problem

because in neutral and park, your not puttng a load on the motor. It is just free spinning. Where if you put it into gear, you are puting a load on the engine because you are spinning the tourqe converter. There is a RPM stall but there will still be more load on the motor while in gear. Is the flickering all the time... idle in park and when in drive ?.... if it is then i would atleast check them.... had the same problem.... turns out i had some serious  plug problems.... saw it as soon as i pulled out the first one.

Yep,

All the lights fliker continuosly whether sitting still and idleing or going 70 down the highway. I'll try to check the plugs, I just thought someone might have had the same problem and it seems like it should be something more centralized like a short in the ingnition or a hot wire some where.The Guy I bought it from said it just had a lower end rebuild, main bearings,pistons,etc.but it was broken into and someone stole his hi dollar amfm radio.I put a cheap one back in and there were a few extra wires , 2 of them were tapped in off the orange and yellow hot wires under the steering collumn. I used the original wires for the stock radio hookup and capped off and taped the wire coming from the #6 hot wires under the steering collumn. Also he said the electric windows worked fine before that and also I can't find the switch for the drivers door that turns on the interior light. All the other doors turn that light on when they are opened. It's just and enigma rapped in a mystery!