1990 Isuzu Trooper repair facility failed

My car wouldn't run and I verified ALL the vital signs

a repair place verified all vital signs (compression, timing, fuel pressure, spark, fuel delivery, and much more even as I"

they said they could not communicate to the compute, that it must be sending out garbage

they ordered MINE rebuilt ($300)

after they got it back I noticed (as I spyed) that it still would not run.

then they figured it out, PLUGGED converter
seriously plugged

started right up

BUT NOW

the computer lights almost always flashes slow
sometimes fast on startup

if I go 75MPH it stays on
if I let off the gas on a good decell it goes off

as soon as I touch the gas pedal, even the minutest
it goes to slow blink.

(they said it means "lean")

i get worst mileage than I did before (17) - now I get 15MPG!

and no matter what sensors I unplug, for days !(MAP, TPS, Oxygen etc) I get no computer codes

it does its 12 three times and does it again 12 three times in continuous loop with no report

they "the shop" are giving me a run-around that I have to wait days, days, for computer sensor reporting

and last they said I must replace the catalytic convertor else the whole system won't work right.

(hey, the O2 sensor is BEFORE the convertor)

PLEASE help me
the car feels like it runs great
i did advance the timing a bit after getting it back

i have been monitoring this for two weekd now
i have even substituted "new" sensors when I've bench checked then already (you know, volts and ohms, I'm an E.E.)

THANKS and I will pay more for the solution to this. I am so tired of chasing - guess I shopud have went to the dealer.


Please answer each concern you see in this letter

Carlton Lovejoy
512-552-4391