There are two engines available in 1991, the 4AFE (most common) and the 4AGE (rare).
There are also the Federal/Canada and the California engine. The difference being the CA engine is equipped with EGR, the Federal/Canada is not.
The EGR is located to the rear of throttle body on intake manifold.
There is also a sticker on hood with would say "EGR equipped" or Federal/Canada.
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Wednesday, April 1st, 2009 AT 7:53 AM