ecm

So I bought this Jimmy 4x4 that has been sitting for 2 years, threw in a battery and she started right up. It's running rough, the CEL/SES is on and so is the battery light. I went to plug in my OBD2 computer but it says the connection failed, tried a different one and same thing. Anyone have...

'96 Suburban, 7.4L Supercharged, Auto, 4WD. Stuck at a Home Depot. Turned truck off, now won't start, won't crank. 65 degrees. Headlights, radio, interior lights work, good charge. New battery, new starter, fuses good (new today). Starter gives a 'click' when ignition is turned, but no...