howdy. the 2.3 engine in my 91 isuzu stalls and idles bad. iam the original owner and have over 177,000 miles on her. i have just recently replaced the spark plugs & spark plug wires, coil and fuel filter trying to fix this. prior to this problem she ran fine (perfect). less than a year ago i had stalling issues and replaced the distributor cap and rotor along with the fuel filter and ignition coil. i have also just cleaned the EGR valve (dirty) trying to fix this problem. im holding off on buying parts that will not fix the problem. any advise that helps is welcomed. thanks in advance.