mine was kinda similar to that, it was a power brake booster hose on my intake manfiold and the hose kinda swelled a bit causing the engine to lose some of its vacuum and it ran pretty crappy when i was at red lights and such.
2002 Cougar
2.5 duratec/ mtx-75
85,0000
Mondeo ST-200 wheels/BFG KDW NT
black/black
Spec Stage 1
Torsen T-2
Trubendz 2.5 flowmaster dual exaust
apexi s-afc II
K&N FIPK
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