Hi...just joined. My ride is a low mileage 87 Ranger 2.9 with the A4LD trans. If I just start and drive without slowing down to an idle until it warms up fully, there is no problem. However if I'm doing stop and go and it's only partially warmed up, it will go suddenly into a rough idle condition and sometimes stall. I've noticed black smoke out the exhaust when it does this, not always but occasionally. I don't have a code reader and was hoping I could avoid the shop cost of having the codes read, by finding someone on this forum that could give me some things to try without spending a bundle. I got some wrecker components and tried them with no improvement. These include the TPS, IAC, MAP and a weird vacuum device on the passenger side fender near the starter solenoid. I have no guarantee that any of these components were good so I'm prepared to start over if someone has some suggestions from similar experience.