hi everybody,
   I posted the other day on this car with no response...The plot thickens...
My 93 bonneville se has several of us here totally bafffled...Just replaced
the engine with a low mile used one..engine sounds great...Here's the problem.
..The car runs horrible for the first few minutes on a cold engine...it idles
around 2000rpm and nearly dies when you try to accellerate..once running
approx 2 minutes, it's drivable but has a hesitation from a dead start. Once
your moving it runs pretty well.
   The check engine light is on intermittantly and was initially producing a
different code every time I scanned it. Thinking at this point that I had a
bad computer, I replaced the computer. Light's still on and off, problem's
still there but now the only code info I'm getting is "fault in ESC circuit"
and my scanner shows 0 deg timing advance...sometimes?
    New development I think may be related----Now the engine temp guage will
not reach more than 150 deg f.---Replaced thermostat...again...no change,
stll says it's not warming up fully, but I think it really is...{good heat,
fans cycling properly}
    I'm beginning to suspect a bad ground problem somewhere as I have had a
few other wiring problems crop up with the pwr windows and seats which
required running a new grond wire to correct.
    Has anyone seen a problem like this and any suggestions where to look?
                      thanks to all
                                     Gonz