Originally Posted by brian jones
It is through the intake and then it will run good for a bit. I had a problem with the switch in 2009 I installed a push bottom to start it after you turn the key on . Some time the air bag light will come on and all the gauges quiet working . But you can blow the horn and everything starts working again. and thanks for all your help so far bud .
Man, that sure sounds like you have a wiring issue but generally a spark related (or lack of spark rather) issue is going to backfire out the exhaust. Intake is almost exclusively lean or a restricted exhaust.
If you have access to a vacuum gauge I can walk you through a quick and easy check for a restricted exhaust system.
Hook up a vacuum gauge to a manifold vacuum port. At idle depending on what kind of elevation you are at it should read fairly high teens on a good healthy engine, something around 17-20 inches of vacuum.
If it is lower than that check for leaks as this could also cause a lean condition.
Once connected and you have your vacuum reading, slowly rev the engine to approx. 1500-2000 RPM and hold it. As you are reving the engine with the throttle the vacuum will drop somewhat, once the RPM stabalizes at the desired RPM, the vacuum should come back up slightly (probably not all the way back up to where it was at idle).
Once the vacuum comes up watch it and see if it holds or starts to drop off. If you are holding the throttle steady and the vacuum starts to drop this is a good indication that the exhaust system has a restriction. Either a smashed exhaust, plugged catalytic converter or worst case scenario a camshaft with a flat lobe which is not opening one or more of the exhaust valves far enough and letting the exhaust out.
Think of the engine as an air pump. In order to let more air in the air must get out.
A vacuum pump is fairly cheap from NAPA or any local auto parts store and they are very good to help diagnose the health of an engine.
In my opinion the vacuum gauge is one of the most under-used tools anymore yet one of the most inexpensive to own. Once you get good at reading one you can detect things from lean or rich to too much or too little ignition timing to a sticky valve or broken valve spring.
Hope that helped.