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Hi, 1994 4-runner hard-start after 3-4 hrs......All the above are good possibilities and should be checked.....I don't know what changing to E3 means exactly, but if it means changing the spark-plugs, it could be that the plugs are too cold or too hot ....it is probably best to stay with the factory recommended plugs ....some plugs are hot and some are cold ,in case you are not aware of it.......good luck with it....Frankie Don.
Couple of thoughts if you are sure it is spraying to much gas... Have you checked the fuel pressure? If the regulator it bad, pressure may be to high, that would cause it to run rich/spray to much gas. Sometimes a bad temp sensor can cause it also, if computer thinks a hot engine is cold due to bad sensor, it will run rich. Way outside the box is... have you checked Alternator voltage? With engine running, check voltage at Battery, it should not be much over 14.5, if it is way high, it screws everything up. I have never seen a TPS cause the problem.