Had this problem. replaced MAP sensor and it ran great for a few days and quit under power. pounded on the Map sensor and it ran great. next morning back to the same issue of extreme erratic idle. needing to fluctuate the throttle to keep it bucking and snorting. foot off throttle and it dies. If warmed up it may run properly or may not. I wonder if the MAP sensor could be bad even though new. is there an easy test for the functions of the MAP sensor. one other item confuses me. when the key is turned on the fuel pump engages but does not shut off. Both tanks behave this way.
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