help??? limp home condition

[mine torpedo]

bought my 04 in feb of 2009. 2 weeks later, limp condition. dealership replaced throttle body. in dec of 2009, limp again, ford dealership replaced ECU as it has long warranty. 2 days later, limp, turned off, restarted and no problem. this morning, 3 days later, limp gain and turned off, restarted, but engine light stayed on. any suggestions? throttle body only had 12/12000 mile warranty that is now too late as i am in 15000 mile since. t-bird only has 40k on engine. help?