Re: won\'t start unless you pour gas down the throttle
You weren't specific, but we can assume it is a TBI?
And - after you pour gas down it starts and runs fine?
1. The ECM should not be making any noise - ever.
Smells burned? History.
Does it make the noise only during cranking or all the time?
2. Have a listen right at the fuel pump itself. Have someone turn the key on but not start it - the pump should run a few seconds to pressurize the system, then shut off. It won't run again until the engine starts and the ECM sees distributor reference pulses. See if it runs that first few seconds.
3. If it does run a moment, don't crank it, turn the key off, then open the inlet fuel line quickly to verify pressure is there. If not, it's leaked down through that new pressure regulator on the TB - replace again.
The ECM noise - try disconnecting the connectors to the throttle body injectors, see if the noise still happens.
Try disconnecting the connectors to the throttle positioners.
Try disconnecting each sensor, one at a time till it stops making the noise.
I have a feeling you got the wrong throttle body on there, the resistances of the injectors are wrong, creating too much load on the ECM. You can measure the resistance of the injectors to make sure all's well. And - measure to ground, the injectors should not be grounded at all, the ECM does that.
Let us know -