Have you verified that the Idle Control Valve hose is connected securely on both ends going over to the Air Intake Boot?

Here's why I always recommend checking this hose before replacing parts.
Other than a defective battery, the only time my '93 has failed to start since I bought it new is when I stopped at a Target store one day. When I returned to my car, it wouldn't start. I could have replaced the spark plugs, wires, fuel pump relay, ovp relay, fuel pumps, distributor cap, distributor, fuel pressure relay, etc.

Instead, I reached under the Air Intake Boot and I could feel that the hose was split.
I pulled the hose off, saw a technician pull into a parking space nearby and asked him if he had any electrical tape. Sure enough, he did so I taped up the hose and connector, re-intalled it and drove home. I purchased a new hose the next day.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible