My 88 base coupe 2.5 duke is running great (mostly), but 50% of the time it idles low after warm up. I did a head gasket a couple months ago as well as injector o-ring, thermostat, intake temp sensor, egr valve and numerous vac hoses both coolant temp sensors and the ICM. It starts and runs great except for when it starts this idle dipping. It doesn't stall but feels like it wants to. Any suggestions? Thanks!
Its an automatic. The car was running and driving when I got it but head gasket was slowly seeping. I do believe it probably set up some, but it has always run pretty good till recently when it started this.