My 93 GCL 5.2 v8 aw4x4 is driving me crazy. The t.case np249 don't know what trans is in it.I know it's knot the aw4x4think it is42re.My rpm's race up&down then stay in the right spot for a couple miles and do it all over agian. New trans filter,iac,map,tps, trans fluid is good. Only after first...