I have a '94 Pontiac Sunbird, 2.0 OHC, automatic. I have a combination
of issues that I think are all caused by one component. I'm currently
suspecting a bad EGR valve. Symptoms are as follows. ...at first start
up (cold start)...excessive crank time...once it DOES start, it stalls
and "check engine" light flashes. Engine almost seems to backfire (can
hear a "pop" sound in the air cleaner box)., found code for TPS sensor
circuit high. Checked wiring from tps to pcm....ohms tested and
checked for signal and return voltage....all good. Disconnected a/c
pressure switch (as it shares the same circuit and the a/c doesn't
work anyway), seems to help but isn't the cure. I also vacumm tested
my EGR valve...found it won't hold vacuum. Also...on  heavy
acceleration or trying to use passing gear, engine wants to stall out.
Almost as tho the t.v. cable is misadjusted. I suspect a bad EGR valve
(all mechanical type) but wondered if there are schematics, flow
charts, "pin point" tests, or any other testing I can perform that
will help me get a proper diagnosis. Also wondering about the fuel
pressure regulator causing this problem. Car runs fine and goes great
as long as it's not floored. Any help would be great....thanks.

Brennan's Dad