1991 Mustang Misfire rough / no idle

Hi folks, I just picked up a 91 GT for a driver and am now having some issues with it. I managed to get the timing set ok I think but from idle to say 2K it stumbles about and can hear a misfire above 2K the problem seems to dissapear but i would say is a bit off as far as power goes. It idles rough all the time and when cold it will usually die until it warms up for a couple of mins I unplugged all vacuum lines and sprayed carb cleaner around the intake and injectors as best as i could no engine rpm changes also sprayed it around the egr /throttle plate no change. you can hear a misfire when idling and also under load / cruising. Another thing i noticed was when i was playing with the timing I revved up the engine to say 3500 or so and noticed some coolant poor out under the rad. cap it only did this once but though i might mention it. doesnt seem to run too hot from what i can tell and it has a new 3 row radiator (brass). Can anyone help me this is to be my daily driver and I havent even been able to drive it more than 2 miles. when it is warmed up and say you come to a light the engine rpm will decrease and hover around 1100-1200 and then drop back to say the 650 range. some details: 5.0L 1991 GT 5 speed manual transmission.


a big thank you for any help you can provide!!!!!!


I did perform the following:

new cap rotor
replaced pcv valve and grommet
new plug wires
adjusted timing to 10 deg. for now seems to bounce a bit due to the missfire
checked one of the plugs seemed ok bit of a light brownish / tan color to it


next: a match in the gas tank :so