My 1995 Cutlass Supreme is making some unusual noises. I have the 3100 engine with about 145,000 miles that just recently started doing this. The condition worsens when it runs for a brief period of time (30 seconds) then is restarted soon after. If I rev the engine in neutral, this noise happens as well. It is not a cyclical knock. It happens if the AC is off or on so that is out of the question. It sounds like it is coming from the lower part of the engine. Any ideas? Video below:
Another issue I am facing is an occasional violent shudder in the 5 seconds before coming to a complete stop. It also occurs when I slow down and then accelerate around 10-15 mph. I take my foot off the gas and can accelerate normally after that. It only occurs under warmed up condition. I'm thinking shift solenoid? 4T60E. Any help would be appreciated.