Check your main ground. There should be a main ground cable going from the body to the sub frame if you have a chiltons or clymer manual it should show you there. I had the same problem with my 94 F-150. The main ground is very important and will cause similar problems to what you are seeing.
1997 ZJ 5.2L V8,K&N AIR FILTER,FLO-MASTER EXHAUST 2"BB LIFT 30" REMINGTON WIDE BRUTES. ProComp ES3000 SHOCKS, CUSTOM SPARE TIRE CARRIER AND ROOF RACK,HELLA LIGHTS. JUST GETTING STARTED!!!!!
1968 Jeep (Kaiser) Wagoneer, Buick 350 V8, Isky cam,HEI ignition, TH400 trans and completly stock inside and out.