could be a lot of things... a/c on? fuel filter clogged, timing belt worn... you need to provide more info.
changing the thermostat in a 1991 geo metro 1.3 liter
The 1991 Geo Metro EGR valve can be located on the air cleaner housing. The valve will be on the back of the housing.
why does my GEO metro have no take off power
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If its from 85 then its NOT a geo metro engine. It is probably a Chevrolet Sprint engine because they only started making Geos in 88. If you need an engine for your 95 Geo then you could use one of the following: 1991 - 1995 Geo Metro engine. 1991 - 1995 Suzuki Swift Engine, and 1991 - 1995 Pontiac FireFly engine. Hope this helps :)
4
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That depends on what it is doing or not doing.
You replace it you do not fix it.
Yes, the 1991 Metro was carburated. Metro's were carburated from 1988 - mid 1992. Some metros had fuel injection but those are rare nowadays.
don't know what size it is
Can you swap a 93 Geo metro manual transmition with a 95 Geo Metro