I have a 2005 Kia Rio with 170,000mi. that I just picked up with these problems. Car starts up fine but idles rough and it sounds like it might have an exhaust leak. When I try to accelerate the car boggs out and will only accelerate very slow and and it almost feels like it is going to stall. Eventually the car will get up to about 65 as long as I am on a flat road. If I hit a hill the car will down shift and rev up to 3500-4000 RPM and no power. If I back off the car will downshift and maintain power speed again as long as I stay on a flat road. Motor seems to run smooth unless it is under a load. The timing belt has been replaced about 30,000mi ago. Plug wires are new but I dont know about the plugs. Previous owner said that he swapped out the could packs but put the old ones back on when the problem wasn't fixed. Dont know if fuel filter has been done. Both cams line up with top marks. I should also point out that the exhaust smells a little rich.
Also, The Dim headlights don't work and brights do but only when I pull on the headlight switch, nothing happens when I push it forward. All fuses are good but the head relay is gone, I swapped it with the horn relay and still nothing, and the filaments in both bulbs look good (actually new).
Codes:
P0507 - IAC System
P0170 - Fuel trim bank 1 - too rich or lean
P300 301 302 303 304 - Misfire generic and all cylinders
Can anybody help. I would like to test the injectors without replacing them, I was going to try to unplug them one at a time to see if the idle cleans up like I did on my camaro. But, I cant pull the plug off because it is so close to the valve cover. I am thinking injectors are needed but I thats just my guess from the symptoms
Also, The Dim headlights don't work and brights do but only when I pull on the headlight switch, nothing happens when I push it forward. All fuses are good but the head relay is gone, I swapped it with the horn relay and still nothing, and the filaments in both bulbs look good (actually new).
Codes:
P0507 - IAC System
P0170 - Fuel trim bank 1 - too rich or lean
P300 301 302 303 304 - Misfire generic and all cylinders
Can anybody help. I would like to test the injectors without replacing them, I was going to try to unplug them one at a time to see if the idle cleans up like I did on my camaro. But, I cant pull the plug off because it is so close to the valve cover. I am thinking injectors are needed but I thats just my guess from the symptoms