1987 350

[awdvkd]

I have a 1987 350 1/2 ton PU 4X4, last week it started dying all the time. I let it idle for about 15 minutes and it just died three times, its idling rougher than normal. I replaced the Idle solinoid and fuel filter. That solved the engine dying. Then it started to cut out. It can either be just driving or under a load. It seems mostly when it under a load or when the engine shifts. You can see it in the tach, the engine rpm just falls for a second then come back up. I then had it checked for error codes and it said the map sensor was bad. I replaced the IAS and map sensor. Its still running rough and cutting out. I thought about the knock sensor and the O2 sensor but have not done it so for. Any Ideas!