Vac hose on air intake came off cant find location?

by "ram intake" do you mean a cold air intake? Possibly a Vacuum leak. a large vac leak.. Check everything you did for misfits, loose clamps, broken hoses, hoses not installed properly, wires disconnected, if you find no problems replace your "ram air" with the stock components. If the problem goes away its your "ram intake" if the problem is still there you have one of the above listed problems. Best possibilty you did not reconnect the Mass Air sensor, or large vac leak

this is what the EGR looks like, usually near the back of the intake manifold on carbureted vehicles. check the vacuum at the hose before changing the EGR, your vac hose may be leaking instead of a faulty EGR. cost a dollar for vac hose.

If its a vac hose it will have vac in it when the engine is running, or you will have a pipe on the intake pulling air where the hose is supposed to connect.
You may be able to look at a similar vehicle to figure out where the hose goes.

you have a vac leak or broken plastic line . ck from the firewall where the heater hoses go in there should be a plastic vac line possibly red trace its path to the upper intake plenum I also think it has a vac canister looks like a can food comes in located on the fender well

Back in the good old days, engines had various vac hoses that controlled other devices including the PCV valve. The idea was to use one of the vac hoses to pull SeaFoam directly into the intake and help clean deposits off the intake valves.
Today's engines have very few such hoses.
And in your case, the problem is probably dirty injectors or the throttle body itself.
So I would put the seafoam in the gas tank, but also check the throttle body to see if it is gummed up. You can use spray carb cleaner if it needs to be cleaned.

the intake air temp sensor is in the air snorkel in between the throttle body and the air box. There will be a two wire connector connected to it.

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some isuzu have GM components it may have a mass air flow senser,look in the large intake hose from air filter box to throttle boddy ,if not some are bolted to firewall others bolt to intake ,look at the vacuum diagram if it does have a map sensor this diagram will show the vac hose for it

Hi is this a vac hose and you said it goes between the air filter and intake manifold if this is a vac line does it come from the MAP sensor behind the coil pack

if this a vac line is one end attached to anything that could help me try to figure this out for you

Hose goes to a vacuum port on the intake manifold . It's running rough because with the port open you have a vacuum leak. Run the engine and listen for the leak...that's where the hose plugs in.
hope this helps!

get a repair manual