My 1989 Subaru GL 1800 4x4 doesn't have any power going uphill,need help?

sd705

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I changed the timing belt and it got a little better.
Now I changed the spark plugs ( One was very loose) and also i added an additive to clean the fuel injectors and all of a sudden the car runs even more rough!
The engine is newer ( 2000) and hardly uses any oil.
When i start the car in the morning,it needs some time to warm up or it stalls. I have to say I live in Costa RIca at a higher altitude ( 3000ft),
could that be a problem?
Thanks, any help is highly appreciated!
 
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