it seems ok when the engine is cold but when warm it idles ok, if i am
sitting at a red light then the light turns gren the suburban barely
crawls across the intersection. it will cruise on the highway ok but
when i go to pass another vehicle it lacks acceleration. The fuel pump
was replaced a year ago. the fuel filter was replaced about 4  weeks
ago. the plugs and distributor cap were replaced a couple weeks ago.
the exhaust system was replaced from front to back yesterday with O2
sensor simulators and no catalytic convertors. the compression on the
number 1 cylinder is 120. i didn't check the rest. fuel injector
cleaner was added to fuel tank in the last month. the last garage that
looked at it said the distributor was advanced 18 degrees. they set it
for top dead center by pulling out the distributor and moving it over
one cog. I am starting to think the timing chain jumped a cog. any
ideas?