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  1. M

    350 TBI runs rough if at all

    I have a rebuild kit for the throttle body, perhaps I should take the TB off and give it a freshen up, then I have the open end of the fuel supply to adapt onto a pressure tester.
  2. M

    350 TBI runs rough if at all

    Hi, I've got some time to get back to the 350 TBI. The battery was disconnected as it slowly drains flat otherwise (must sort that issue also), so no OBD codes available. I tried starting again, it winds over fast, fires and almost catches but dies. Using a bit of throttle doesn't help much...
  3. M

    350 TBI runs rough if at all

    I'm now ordering the CTS and TB rebuild kit, thank you for your advise, yes standing up the vehicle does it no good.
  4. M

    350 TBI runs rough if at all

    Thank you all, I'll take a look down the TB throat, makes a lot of sense but I wouldn't have thought of it myself. Also I'll read the manual to learn how to read the codes. The coolant Temp Sensor - is there a resistor value that can be used in place of the sensor when unplugged to prove runs...
  5. M

    350 TBI runs rough if at all

    GMFORLIFE Thank you, I hadn't thought about the fuel, I'll drain it and try fresh. I changed the fuel filter. Bextreme04 Thank you also, I haven't ever tried to check fault codes on this truck in 20 years of use, until laid up this time, I'll do that. I can do a compression test. Which...
  6. M

    350 TBI runs rough if at all

    Hi, I have a '90 V3500 crewcab, yes a very late square body, ex-USAF. The truck hasn't been run much during the last year while I had the long-bed buck off to weld small repairs to the under-floor cross-beams. I got the rust fixing/protecting work done and the buck back on and now I have a fuel...

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