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Q: check engine light/ canister purge soleniod/ftp sensor on 1996 Buick Park Avenue

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
had check engine lite checked by auto zone. codes were p1441 , aa1.-failed canister purge solenoid/ or possible code aa2.-ftp pressure sensor. notice not getting good gas mileage as with last tank. someone said to have a smoke test done fisrt before replacing parts to make sure thiers no line leaks?have you heard of this? the supercharge was taken off yrs. back. was getting good mileage till a week ago. only has 109,000 miles. is these parts very expensive or hard to replace by a person with littel mechanic exp. ?
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how ever took supercharger off they probley `left it off motor,i have heared about smoke test before but i never have you one, if it is a supercharged motor that you took put regular intake on the pistons are diffrent , supercharged has less compression than just stock 3.8 engine it probley dont have the power it shood have
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