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check fuel pump pressure- fuel filter --air filter --egr valve if carboned up clean or replace and cat converter feel the exhaust if feels restricted may be clogging up
It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift.
Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps.
The ball joints are going to be hard to due if you due not have an arbor press in your garage. They are not the kind that you can replace by yourself unforuantely without a press to press them back into the control arm. If you know a good cheap mechanic this would be a good route becuase a shop is going to charge you an arm and a leg to press these ball joints back in for you.
The best publication out is printed especially for this its the HOLLANDERS INTERCHANGE BOOK this is the bood and program wrecking yards use to know which parts fit which cars and for how many years.
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