this is the 2nd 1986 plymouth reliant that has done this, when cold it runs fine but when it warms up a bit it misses I checked the codes nothing comes up? Do all 1986 k-cars only do this? because my 88 never misses when it has warmed up a bit, even when it has been sitting in storage all winter.
could be those vacume lines leading to the map sencer, it has had new plugs new wires and a distributor, when driving or when the tranny is in D it doesnt miss at all.