mine was doing the -exact- same thing .......turns out most of the culprit i think was the fan clutch
i pulled my hair out on it for a while ......i think it was a combo of stuff that was causing my problems .........i did everything that everyone suggested above and it helped ,but mine still seemed like it wasn't working like it should ..........i changed the fan clutch (witch was only 1 year old )....and it made a big difference....now the car runs at 180 witch is where my thermostat puts it .....even while running it hard on 100 degree days
fan clutch seemed fine ,felt fine but it made a big diff after changing it
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the "not so old",old guy
87 Mustang GT T-top >hanlon t-5, pro 5.0, centerforce clutch ,adj. cable/quatrant ,3.27s ,full 2 1/2 ex(off road H) adj. reg. ,e-cam ,70mm TB, cobra intake ,1.7rr ,ported/milled e7ets w/crane springs ,306 balaced/decked short block w/speed pro forged flat top pistons ...257rwhp/302rwt
best et 13.7@102 (4/11 )
'80 Capri (future project,currently collecting parts for 351 moter)
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