About 2 months ago my 91 NA broke all of the belts and overheated. After changing the belts the car would leak water and started running rought. Another problem that has appeared is that it has been running very rich. I have the idle set all the way up but it will only idle at about 800 RPM. I have done some mods like a custom cat back and a cone intake filter. I have changed the fuel filter and clutch in the last 4 months. Please help.