Howdy, John
Appreciate your reply.
FYI In process of Idle/cruise actuator replacment I renewed intake man. gasckets.Being a pre 1996 car it is not OBDII capable but I could retrive some codes of the ECU which indicated ECT and intake air temp sensors mulfunction,well the ECT and IAT sensors and wirring harness are new,still gives me the same codes.
It is hard for me to imagine IGN sys is causing this since as soon as you shift to R or D Idle stablizes immidiately,also it idles good when the eng is cold(for 3 to 4 min).