2.9 ranger barely runs
I finally got my truck running after replacing a few parts, barely though.
I just replaced the fuel pressure regulator, ignition coil, distributor with new module, timed at 10 deg, engine was at TDC when distributor was done, also has all new plugs, and all gapped at .045. I even cleaned the EGR hoping for a lucky fix. But my question is does anyone know why the truck will idle with the red vacuum line disconnected from behind the throttle body on the pass side, but not idle when it's connected? With it off it idles very roughly but it will stay running, until I reconnect the line. Checked the vacuum box under the filter box, no cracks, and holds air. All vacuum hoses are connected, but when it's actually running I can hear what sounds like air being blown into a plastic box. Not sure if the rough idle is vacuum related or not. Any help is very appreciated, thank you for any input.
Sent from my iPhone using Tapatalk
1987 ford ranger 4x4
Single cab long bed
2.9l 5 speed
Stock except lift