Hi, everyone I’m new to the forum. I have an 86 Mercury Capri with a stock 3.8L engine. Recently I was driving and the RPMs won’t go above 2000. So when I’m on the freeway it won’t want to go above 55mph. I try to accelerate but it just won’t want to go and the engine feels like it wants to choke. The car otherwise drives okay under 2k rpm. I also have recently done a lot of maintenance on it. Thank you in advance for the help.