sluggish IAC motor. (IDLE AIR CONTROL) Controls idle Also many (maybe most) stalling problems are caused by vacuum leaks.
NO not that engine.
7 degrees idling @ 500rpm (650 for USA)
With the tan/black timing wire disconnected, with engine idling and warm, ignition timing should be set to 0 degrees.
The most likely cause of a 1992 Ford Aerostar stalling while idling is bad spark plugs. The plugs should be changed and the timing checked to resolve the problem.
Incorrect timing can cause several problems. One of which is high idling. 5000 rpm sounds high though, there may be other problems as well.
I checked the Gates website ( they make timing belts etc. ) and they list a TIMING BELT for the 3.4 liter - V6 engine in a 2004 Toyota Tacoma ( also , it IS NOT an interference engine )
your engine has a timing chain,no rubber belt but after 250k plus the chain wears and should be checked
You may want to have the engine timing checked?
I the Blazer will run then the timing can be checked with a timing light. If not, the there are timing marks on the timing gears that will have to be checked to see if the timing jumped.
The typical timing for a 1985 Chevy 454 is 8 degrees before top dead center. The vacuum line removed from the distributor and plugged. The engine warm and idling at 700 rpm.
The engine is out of time. Have the engine timing checked. It can also be the plug wires are connected incorrectly.
CHECK THE TIMING