1998 chev K1500 5.0L engine, I had a leak in the intake gasket and changed the gasket. when I put it together I had trouble with the Top dead center and it wouldn't run. I finally got that right and the engineer starts but when it starts it's running like someone is stepping on the throttle to the floor then it stalls in 10 seconds.

SOURCE: 95 chevy monte carlo vac leak

It sounds like the Intake Gasket may have slipped a little During the Install. This would cause the Preassure Problem. Let me know so we can go further if needed. Please Rate my Response, I need all the Help that I can get! Thanks!

SOURCE: high idle air intake gasket

HI!!! first try this get brake cleaner.go little bylittle spraing all around the intake if run normal and changes the rpm.you have intake leak' o change idle sped sensor

SOURCE: intake gasket went bad on 1998 chevrolet lumina

There is None to my knowledge.. Ive done thousands of them.. Its way too hard to explain.. I did my first one by the seat of my pants.. only advice I can give is : Dont mix up the pushrods!! If ya do,, it'll warp valves bc the intake and exaust push rods are different lengths

SOURCE: stumbling idle, stalls when throttle opens

If the car is running that bad the check engine light should be on and code/s stored in the pcm along with a snapshot of what is going on at the time the code is set. A possible solution is to check the Mass Airflow Sensor or the MAP (manifold absolute pressure) sensor depending on which your vehicle is equipped with. The engine may run until the engine computer switches to closed loop fuel control (means its warmed up and the pcm is in control of the fuel trim) and then stall upon accel. Be sure you have checked all the basics first.

SOURCE: 98 Expedition coolant leak top back of engin

Sorry im late with this,i couldnt seem to log on....The answer to your question is YES,there is a steel line under the intake with a short piece of rubber line attached to it and you can just about see it from the front of the intake with a light,it can leak and cause coolant to run off the back of the engine,The intake gasket set alone is about $40.00 and i dont know about the rubber line,i have seen it physically but havent changed one yet.Note the date of manufactor just incase,i bought an intake set for a 99 and the engine design was changed half way through...its not too hard to pull off the intake and re-install,you will need a 7mm socket for the coil packs,8mm socket for the fuel rail bolts and lower intake bolts and power steering bracket bolts and throttle bracket bolts,10mm socket for the intake bolts and alternator bolts and egr valve,and a large cresant wrench for the exhaust tube thats connected to the egr valve,flat screw driver for the air cleaner...and plenty of extensions with a swivel to be able to get to the back bolts of the intake....just incase you do it yourself this info could make it easier to gather tools.Its about a 3 1\2 to 4 hour job start to finish for the first time doing it,includes cleaning everything..Good luck