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stalling on deceleration or when coming to a stop
with 97k. here's a bit of history since i've own this car. the firth month the can run great! when about once a week the car would stall sitting at a red light and i notice that it got harder to start.(about 1-2 sec. holding the key in the start postion). took it to the shop, they had it all day and said it would cost about 800 dollars and that was only for a tune-up and a coil pack. i was like WOW you are kinding, rite?!? so i stoped at the parts store on the way home and bought plugs, wires, gas and air filters, about 80 bucks.
after removeing the fuel filter i notice a rust color goo in it! thats it i said to me self a dirty fuel filter! the car started rite up! not the 1-2 sec start, and ran great again for a week or two. i replaced the fuel filter again, it had a little less goo this time. once again the car ran better (not great)this time. now it doesn't matter if it's a new filter or not it keeps stalling.
i have checked all the vac.lines using carb spray and found no leaks. also cleaned the EGR, pvc and the IACV(idle air control valve). once again this seemed to do the trick! but again the stalling returned!
now the car stalls at least 10 times on the way to work and 10 times on the way home.
but now the check engine lightcomes on when the car stalls, the code is P0172 and that sulphur smell coming out of the exhaust. at a light the RPM gauge will start at 800 and steady and then jump up to 1500 down to 500 back up to 1000 then to zero and stall. some times the car's computer will try to fix this proplem(i think) and over do it causeing the car to jump forward slamming the trans into gear hard like.
this stalling thing is VERY dangerious for me and i'am a guy just think if a woman or elderly person were driveing it when it stalls and have no power steering!
please help me track down this hugh problem.