Replace plugs, wires, cap, rotor, coil. Starts up fine. Idles fine in park. Increase in speed is fine too, even to full throttle. However holding road speed, any speed, it misses terrible. When I come to a stop, it usually dies. Just started doing it this week. That's why I replace everything. Not sure of the next step. I wish it had OBD2.

OK. Now I read the codes. 12 14 55. I guess only 14 means anything. Improper MAP voltage. Is this the problem?

 

I am guessing no codes? Without seeing the van, you could have a plug EGR tube, MAP sensor out of specs, dirty throttle body or speed sensor. Also the temp sensor could be out of range too.

 

OK. I added to the message the codes of 12, 14, 55.

I befuddles me that it doesn't miss under acceleration.

 

It was the MAP sensor. If anyone buys one, research it. O'Reilly wanted $73 for exactly the same brand and model Advanced had for $52. However Autozone had a Duralast branded one for $36, which is the same price as RockAuto.com shipped.