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when it reaches 3000 rpm it studders up and down
is it my battery cables?

Just replaced Catalytic converter and three of 4 02 sensors.
Check engine light back on and now flashing. Auto Zone checked codes twice and it keeps coming up with same codes, 02 sensors, the same ones that have been replace. Also now says it's miss firing. I am at a loss what to do next.
1994 divil concor
The car runs fine. Then, when I shut it off, It won't restart for about 10-15 minutes. This just started happening.
replace battery replace starter would jump start run but now would start even with jump start but lights on dash comes on everything else dead
replace battery replace starter would jump start run but now would start even with jump start but lights on dash comes on everything else dead
my fans will not work unless the sensor on top of the engine is unplugged. the sensor is new. email me at jrymntgy@yahoo.com
for a lexus and how could i fix it
I have a 2002 Park Avenue.

I have replaced the PDA fuse in the fuse panel.
I have checked the 30A fuse in the main fuse box labels door windows

I have replaced the switch assembly (which contains the up/down buttons for the door) with a new assembly from my Buick dealer. The have replaced the Driver Door Module #25721016 with one obtained from a junk yard. No change at all.

The original condition exists.
odometer, and temperature gauge appear as if I've lost power but I don't lose power. I hit my hand on the the top of the dash and everything comes back on again. Any thoughts on why this could be happening. I do have a newer battery-less than a year old.
what is a relay box where is it located
where is the headlight relay box located
i have checked fuses and bulbs even replaced brake light switch
i got a pin hole leak in the cylinder and i need to replace it.i just cant seem to get the wrench or socket close enought to the fire wall to get it off.