1995 geo metro running issues
a GM suzuki swift.
G10 or G13 engine? both are EFI no carbs here, in USA. 95.
last carb usa 1994 Isuzu.
OLD gas goes bad clogging that Injector or if MPI ? injectors.
Old spark plugs cant burn old gas, like a double bad effect.
give a tuneup> last decade?
Nix, that sEA-Floam, use Chevron, Techron injector cleaner
its got the REAL clearer called Benzene, costs more but is MORE.
all that said , i never use additives. (snake oil ever)
after all cleaning and injection system correctly is hard work.
so I offer this comment based on, (fast and dirty fix)
sure, ISC dirty, they love to jam parked for a year.
EGR and PCV gasses, there form gunk,
Gunk cloggs, ISC, valve, (electric) idle speed valve
i cant drive car, see if right for overcomes a dead isc easy
if the lower RPM is from MISFIRE< i can hear it and feel it.
and Misfire has over 50 causes, spark plugs bad tops the list.
when it wont start to the operator guide , stated unflood method work. cranking wide open throttle, work?
I bet the PCV is clogged to. valve
steam, is a whole other matter, non of which is good
do a hard leak down test?
new head, was it milled (shaved) or put back not checking
for warp-age like the Service manual directs?
warped head bust be de-warped using baking oven.
Ask your machinist this is knows this very well on alumin, heads.
Id work steam issue, hard and not drive too far, like that,
Most heads replaced, DIY fail.
for 2 reasons,
not dewarped, and not surfaced correctly and other reasons.