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Fox Body Mustangs
sputtering at high rpm. 90 lx .
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<blockquote data-quote="EFFURJDM" data-source="post: 11554787" data-attributes="member: 124698"><p>hi guys so a month ago i bought a 1990 lx mustang. owner said was sitting since 04 , but would start it up ounce and awhile. on the oil filter it said 04-12-02 , so im guessing the tune up was a bit pass due. </p><p></p><p>ever since i got the car it would sputter up to 3grand at WOT . car starts up every time , and runs fine at cruising speeds in town or at a 75 mph on the freeway.</p><p></p><p>so i google and did what others did and suggested. </p><p>i have changed the </p><p>spark plugs </p><p>plug wires </p><p>oil </p><p>oil filter </p><p>gas filter </p><p>and cold air intake. </p><p>some one said maybe clogged cats , so i got a pyppes o/r x pipe and now the car revs up to 4g but then starts to run bad again after that. </p><p>car had very little gas when i got it and looked inside the tank seemed good.</p><p></p><p>so i can only think of fuel pump is going bad. i already dropped the tank to change the sending unit so would hate to do it again. </p><p></p><p>when i floor it and push it it makes a loud pop/bang i think from the back or from the right side of the front car .dont seem to be a back fire cuz u can feel it threw out the car. and i know what a back fire is , its not this. im not 100% sure what else it could be.</p><p></p><p>so i need help lol </p><p>any help would be great thx guys .</p></blockquote><p></p>
[QUOTE="EFFURJDM, post: 11554787, member: 124698"] hi guys so a month ago i bought a 1990 lx mustang. owner said was sitting since 04 , but would start it up ounce and awhile. on the oil filter it said 04-12-02 , so im guessing the tune up was a bit pass due. ever since i got the car it would sputter up to 3grand at WOT . car starts up every time , and runs fine at cruising speeds in town or at a 75 mph on the freeway. so i google and did what others did and suggested. i have changed the spark plugs plug wires oil oil filter gas filter and cold air intake. some one said maybe clogged cats , so i got a pyppes o/r x pipe and now the car revs up to 4g but then starts to run bad again after that. car had very little gas when i got it and looked inside the tank seemed good. so i can only think of fuel pump is going bad. i already dropped the tank to change the sending unit so would hate to do it again. when i floor it and push it it makes a loud pop/bang i think from the back or from the right side of the front car .dont seem to be a back fire cuz u can feel it threw out the car. and i know what a back fire is , its not this. im not 100% sure what else it could be. so i need help lol any help would be great thx guys . [/QUOTE]
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sputtering at high rpm. 90 lx .
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