Can someone tell me the symptoms of the map sensor going bad?

ive had a few people to tell me that my map sensor may be bad but i put a code reader on it and it showed up ignition control module but i changed that and ran some fuel system cleaner through it and my truck still does alot better now, i can drive it for an hour and it doesn't start shaking and missing horribly now but the engine speed lopes when its idling or you hold it at a constant speed in park, i think this started after i got a guy to clean my throttle body out for me, could that have messed anything up?
Added (1). it's a 1988 ford f150 xlt lariat, 5.0 engiine

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