Question about 1985 Oldsmobile 98

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Auto problem I have an Oldsmobile Ninety Eight model that has 118,000 miles on it. My problem is a jerking at acceleration. It does it more lately than it has before and I noticed that the RPM is dropping down below 1 and then rising above 1 even when stopped. I just replaced the alternator because the care starting stalling at stop lights, however, it started right back up. When I took it to the shop they told me that it was only getting 11amps of juice from the alternator. My battery was only a month old so I figured this is why it did not stay dead. I still have the jerking and of course the shop says they fixed real problems but that I have something else going on. I told them to fix the ****. They just got me for $700.00. I don't have the money to play the process of elimination game. Any ideas on what this could be?

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I had that problem with my 91 Bonneville turned out to be the map sensor. Not sure if an 85 has that sensor or not...

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