Originally posted with car acting rough in reverse when engine cold...
Then, very intermittent miss until engine warm...
Then, codes, P0316 and P0301...
Changed plugs and wires, tested coil pack, checked for cracks, sprayed with water, etc... Have pretty much ruled out ignition issues...
Now, engine light is off, just checked codes, none pending,
Car is running worse than EVER!!
What we HAVE done,
Cam Shaft Synchro replaced 5 months ago
Plugs (2wce in 5 months)
Wires (2wce in 5 months)
Checked coil pack
Took into Pepboys last week,(prior to new plugs and wires) They said to do tuneup and that injector 1 was possibly running lean...
valve last night
Topped off gas and put in Marvel MYstery Oil last night...
Now, car still misses in reverse on cold engine and first start up after sitting 15 or more minutes
Car misses intermittently in drive at stop, sometimes 4 misses in row, sometimes 1 miss every 10 seconds, sometimes no miss
On way home on highway at speed, when accelerating car started to miss
Car gas mileage is better than usual
No gas smell
Car does NOT miss in Park or Neutral
When first starting car, RPMs fluctuate several times before settling down
So, could a lean injector cause wierd intermittent miss, could it be dpfe