Intake gasket went bad on 1998 chevrolet lumina

Fuse number 1!

Chevrolet Lumina (1995-2001) fuses and relays

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Fuse box diagram Chevrolet Lumina 1994-2001

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Fuse box ?1 diagram 2000-2001 - Instrument panel fuse block is located on passenger's end of instrument panel. fuse box diagram. Assignment of the ...
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Chevrolet Lumina (1998 - 2001) - fuse box diagram - Auto ...

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Jan 1, 2018 - Chevrolet Lumina (1998 - 2001) - fuse box diagram · Instrument Panel Fuse Block · Underhood Electrical Center - Passenger's Side · Underhood ...

Check the timing belt.

it is 100% intake gasket,if you check the coolant reservoir,and there is oil in it,if it was head gasket you had white smoke out of tail pipe and loss of power
you can run run the cylinder compression test,

gm used crappy plastic intake manifold gasket,
unfortunately, it is about 1000$ or so fix

there are 2 intake gaskets, on on each head where the intake sits, if you are unsure about the job i would get help, there is no room for error.
when you get new gaskets get the metal ones, the plastic ones don't last.

BETTER OFF DOING HEADGASKETS IF YOU ARE GOING TO DO INTAKE GASKETS BECAUSE YOU WILL BE 3/4 OF THE WAY TO HEAD GASKETS. INTAKE GASKETS ARE COMMON, AND SO ARE HEADGASKETS.

First thing that pops into my head is a leaking intake gasket. Second is bad head gasket. Third is cracked head or engine block.

sounds like you have blown head gasket, or cracked head, did the motor run hot, if so, you can try head gasket, maybe you will get lucky, also i would replace intake gaskets, parts should be anywhere from 50.00 to 200.00 dollars, depends were you get them,need to clean out cyclinder with antifreeze in it, and check other ones too, pull plugs out get somebody to turn motor over watch for antifreeze coming out of spark plug holes, maybe you can put head gasket on and keep on riding...

Most likely cause is the intake gasket leaking. The 3.1(4) and 3.8s are bad about it. Possibly a head/head gasket, but not as likely.

is it an auto choke if so it may not be working some cars have a cold start which is on the inlet manifold and some are in the carbs them self but i think it is not working so that is why it runs rough when cold hope ive helped you

check the crank sensor