I have a 91rs 3.1 v6 that would start, run, no codes, as soon as you crack the throttle it would die. Things I checked before replacing ECM, Fuel Psi., timing, coolant temp. sensor., Tps, Iac Solonoid, Things I just replaced for GP because I got this Car from a junk yard, Ing. Module, Dist. rotor and cap cleaned rust off contact points under rotor, Plugs and wires, fuel filter, drained and filled tank 5 gall. prem., found a lot of play in the chain and changed it both gears and damper, fuel psi would not drop after starting changed fuel psi. regulator fine now and found one bad injector mine all read 11 to 12 ohms. but one, book says anything below 8 is bad. Even got a code 13 once and changed O2 sensor and found knock sensor wire disconnected and hooked it up. So now after all that no change but as I read in the book I found a line that said that in the event of a ecm failure the cooling fan goes on to save from over heating. Bingo as soon as the car came down off of high Idle from cold start the fan kicked on. so that left me to thinking is it the ECM or Chip. I guess you have to think about the two like this when your dealing with them, Chips are the brains and the ECM is the body and the body is what more often gives out first, so I'm so glad this one did'nt have DE DE DE also.