changed head gasket, timing belts, oxygen sensor,
Car should be running good.
changed the o2 sensor because of code and timed it last night.
when driving it has a bad miss and jerks alot then smooths out and runs fine then starts missing/jerking again.

What did I do wrong or forget to do????

intake air leak?, loose timing belt?bad igniter??

 

Sounds like a ground or vacuum problem. Does it happen at the same speed, temp, gear?

 

Fouled Spark Plug?
Marginal Ignition Cable?

Will the engine do this either at or just above idle?

P

 

all gears and minimally at idle

 

at idle it wasn't jumping time but after i test drove it and it was jerking I put the timing light back on it and it was still timed but it was jumping time now and then

 

plug wire or other ignition