My 91 240 s/w 177K miles, has been idling roughly when cold, it seems to run better once the engine is at operating temp. I checked the codes and got a 2-3-2, "fuel system compensating for rich or lean mixture at idle" I also looked at the plugs, cap and rotor and they need replaced. I though maybe the temp sender was bad, but I did not get a code for that. How do you check fuel pressur on these cars? Any other advice?

thanks
dave

 

Check for vacuum leaks, clean/replace air filter. If the engine is not noticeably rich (exhaust smell) then it's likely to be something like that.
When I drove my car back on a 11 hour trip after buying it, I had 232 code, the AFM intake screen was heavily blocked with air box silencing foam.
So, it's not just injectors etc you should look at.
By the way, reset the ECU after you think you've fixed the problem.

Regards, Andrew.