Q: My Toyota 5L smokes black when gooing uphill and loses efficiency. What could be the problem?

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my toyota 5 litre diesel smocks black on going up hills and reduces efficience. this normaly happence together with delayed gear changes being an automatic vehicle, the rave counter will go up to 4 instead of normally 3. however on straight roads it normally changes on 3 but when going on up hill i have to rave up to 4. when it changes to the next gear the smoke stop. i have recently changed the air filter after the warning sign had appeared but the sign could not go off. a mechanic has advise me that i have to disconect the battery for a while for the air filter warning sign go off. what could be the problem for the above.

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