Does anyone know where the timing advance wire is on a 1995 k1500 suburban 5.7 tbi? I have looked near the distributor cap,along the fire wall and behind the glove box.It is supposed to be a black/tan wire.I set the timing to 0 tdc(that's what the tag on engine compartment says), however the timing seems to go to 2-4 degrees before tdc.I read somewhere that you have to disconnect the advance wire when you set timing,then re-connect.Another problem I'm having is loss of power.I just replaced the intake gasket.(no leaks in oil or water).The truck idles fine,but bogs down when I put in gear.I'm going to take the tbi off and re-install to make sure there is not vacuum leak.I checked the map sensor(it's fine.) I haven't checked all the vacuum hoses for leaks yet.(not sure what to use.some people say carb cleaner eats gaskets up).I haven't checked the ground cables either.