Hello,
I have a 1997 Base model 850 Sedan. It has 261xxx miles on it. I have just replaced the fuel filter, air filter, spark plugs, and distributor cap and rotor. After doing this the car would start right up, but it would take longer than usual for the RPMs to stabilize. They would dip way down and almost shut off. My car also does this if I put it in neutral above 30MPH, roughly. It is an automatic transmission with no engine mods. Any help or suggestions is greatly appreciated, thanks.

 

Sounds like you have a vac problem. Did you knock something loose?

 

I will check that ASAP. We had to remove one of the vacuum lines when we took the air filter box out. I hope that is all it is, thanks

 

All the lines seem attached well.