Stumble after a big pothole?

My car occasionally will stutter/stumble/bog on acceleration occasionally.



no set pattern just randomly. cold or hot. lots and lots of new parts.

including the whole igntion system.





today i hit i big pothole and the car did this really weird. quick misfire/stutter. and then was fine after.



i do have a worn rear motor mount im going to get done after my rear brakes this weekend.



i checked the ground to the tranny and the one my the power steering.



anywhere else?



i read it could be that. but whatever it is. its electrical seems like.

Reply 1 : Stumble after a big pothole?

have you checked the vacuum lines to the fuel rail? i know you replaced the vacuum lines but this one will do something like you are experiencing. other than that maybe you have a cracked wire insulation somewhere in the wiring harness

Reply 2 : Stumble after a big pothole?

to the fuel rail? hmmm didnt see any there?



the brake booster hoses are new. and yes all easily visable hoses are replaced.

the most hidden one being the egr to egr filter i would say and one below that which i beleive is to the back of the fuel rail.



i know my batterys slanted (the way the mount is) i read someone had there pos terminal hitting the hold down and grounding it out.

ill check grounds tomrw.



could my bogging be a bad fuel injector o ring?

im just at a huge loss with that.

reset the ecu trying to solve some problems. plus i have a cold air intake and dc sports exhaust.

got a little power. had timing advanced 2 degrees and reset it again. cause the gas pedel felt spongier than before. and its never been as peppy as it was the first time i reset it.

Reply 3 : Stumble after a big pothole?

heres a list of new parts.



o2 sensor,oil temp sensor (it was leaking a little),fuel filter,air filter,vaccum lines,trans mount,front mount, (rear mount was the actuall bad one lol). new tps,egr cleaned,throttle body cleaned,new gasket on throttle body,new distributor,cap and wires (napa premium plus) denso plugs,valve cover gasket. thats basically it.

Reply 4 : Stumble after a big pothole?

at least on my v6 there are vacuum lines for fuel pressure regulation.

Reply 5 : Stumble after a big pothole?

did you change your air flow meter?

Reply 6 : Stumble after a big pothole?

Mine did this until I retimed it. It turned out it was 4 degrees ATDC omg!



It needs to be 10 degrees before top dead center. Unless you already did, then just disregard it.



But mine stumbled when cold before being warmed up until I got the timing right.

Reply 7 : Stumble after a big pothole?

its timed 2 degrees advance from 10.

i timed it by ear. then took it to a shop and they said it was dead on 10.



i got good ears apparently or good luck.



the air flow meter no havent checked really. might just replace with one from the junkyard. could be my problem i suppose.