Strange question, I know but I have an 84 K20 w/502. Bought truck with an OLD analog Projection 4 fuel injection system. Truck runs amazing at full throttle but stalling when slowing or stopping and hard to get going again. I changed all tune up stuff, fuel pump and even new distributor b/c someone suggested it. Still SOS. I called Holley to get troubleshooting help with this analog fi. The guy said I may have a bad ECU. I don't c an ECU anywhere and I'm pretty sure it doesn't have one. Anyone kno where I might look for this? Could it be under dash? I'm getting ready to change the fi over to a holley demon carb but if anyone has suggestions what else can be causing so much trouble, I'd love to hear it. Plugs are getting trashed right away, even brand new plugs. Truck started running like crap when slowing or stopping, now it's studders constantly accelerating. It runs at idle but as soon as I put in gear or try to accelarate, she dies. BEFORE this it ran great at full throttle but dying at stops. It progressed to where I'm at now. Hoping for suggestions before I pull this old analog off and change to carb.