A vaccum line could be leaking, causing the engine to get more air than fuel and run lean or misfire. If you spray just a little throttle body cleaner in the engine while its idling usually the engine will speed up if a vaccum leak is present. Many times you can hear the hissing noise too.
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93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
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