what could cause this

1999 BUICK LESABRE
85 MILES
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PAPADUCKIE
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had problems getting the car to run finally got it to idle real well with no problems. now when I try to give it gas it hesitates. I can get it up to about 4000 rpm`s and it will hesitate between 4k down to 3k rpm`s with idle held in same spot. if i try to give it more gas than 4k rpm`s it tries to die out. not sure what would cause this as the check engine light does not come on and I have replaced fuel filter. fuel pump relay, cleaned maf sensor checked tps sensor and replaced 2 cracked vacuume lines to get it to this point. I`m thinking maybee a pluged fuel injector but not sure. any help will be greatly appreciated
Apr 24, 2012 at 3:52 PM
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RASMATAZ
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Go to this walk thru link: https://www.2carpros.com/articles/engine-hesitates
Apr 24, 2012 at 4:02 PM
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PAPADUCKIE
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I have replaced the plugs with bosch platnum+4 car idles great but when rpm`s get to 4000 it goes back to 3000 and back to 4000 and flucuates between there with throttle held in same spot. this has me baffled I have lucas fuel treatment in gas and it doesnt make any difference
Apr 24, 2012 at 11:19 PM
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