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Not sure if you’re aware of the cracking issue on these rails. These are pictures of adding gussets in the area that is prone to cracking.

Are you keeping the 162 skid or swapping it for something shorter?

Are the valves tight or loose? if the valves are tight, its the valve face wearing into the seat. Its normal to loose some clearance when the engine is braking in, mostly on the exhaust side. Once the engine is broke in you shouldn't see much wear after that. If they are constantly loose when...

Be careful using dielectric grease on pressure sensors, (MAP, altitude) they have a small hole in the sensor which may go through the electrical connector to get a atmospheric reading, if you plug this up with grease it will not longer be accurate and may cause running issues.

That looks like one of the big ones that attaches the IAC to the air box. If so then no it won’t cause your problem. The extra air will come from the vacuum side of the TBs.

It would be a good idea to remove the TBs and check the boots, but you don’t need to take them off just to replace IAC. The boots tend to dry out over time and crack. The hoses are going to be tight as they bond them selves to the fittings over time. I normally use a pair of pliers on the hose...

Yes that is the thermowax, the 2 lines that hook up to it are coolant lines. When the engine is cold it allows more air to bypass the throttle plates through the IAC. As the coolant warms up the wax, it slowly closes off this extra air, then your idle adjustment screw takes over. Your throttle...

IAC is (idle air control) on this engine it is adjusted manually. The part you circled in the post above is your idle air control. If you look at the parts manual under intake 2, part #40 is the idle speed adjustment screw. If you turn this and the idle speed does not change something else is...