Whats the torque setting for my 2001 hyundai tiburon on the intake manifold

https://www.cargurus.com/Cars/Discussion-c3329_ds516302

https://www.google.com/search?q=pontiac+grand+am+lower+intake+manifold+torque+settings

..

Sort of depends on what you mean by "lose power". It is quite normal for most engines to have lower torque at high revs than at lower revs. Air intake isn't as efficient, each cylinder charge is smaller, etc.
You might want to put in a new air cleaner, check fuel filter and pressure...

Head bolts are torqued in 3 steps, 1-18ft.lbs, 2-60 degrees, 3-60 degrees, camshaft caps-10-11 ftlbs, intake manifold-12-17ftlbs, exh manifolds-32-40 ftlbs, camshaft pulley-74-89 ftlbs.

Torque converters are bolted up to the flywheel or flexplate. Probably 4 or 6 bolts from the flywheel engine side into the torque converter.

start in the centre and work out diagonally.

cylinder head bolt torque

10 mm bolts

step 1 22 ft lbs
step 2 additional 60 degrees
step 3 additional 60 degrees

12 mm bolts

step 1 26 ft lbs.
step 2 additional 60 degrees
step 3 additional 60 degrees

exhaust manifold nut 32-41 ft lbs.

intake manifold nut 11-15 ft lbs.

rocker cover 71-86 in. lbs.

Intake manifold using new gaskets. Torque the bolts, in sequence, to 105 inch lbs. (12 Nm)...



Fig. Intake manifold torque sequence-3.7 & 4.7L engines


Hope this help (remember comment and rated this).

If v6 may need to remove intake manifold and applicable parts to gain acess to spark plug coils, remove coils and remove plugs install reverse order
If 4 cyl remaove cover on valve cover remove spark plug coils etc.

You have to remove the air intake manifold. The last three are under that. If you dont feel comfortable taking it apart then take it to a dealer.

The IAT sensor measures the temperature of the intake nmanifold. The ECM uses this sensor reading to set injection timing and adjust the air-fuel ratio. If the fuel mileage and power output of you engine seem low, some owners have found improvement in EGT, fuel economy, and power after cleaning carbon from the IAT sensor in at the rear of the intage manifold.