Q: Rough in morning. 0 compression. after heats up runs okay to 100 compression. in 3 cylinders only on a Miata 2004.

asked by on March 16, 2017

2004 miata runs rough in morn. until warms up. when cold eng. has 0 comp.and red light is on. when warm runs ok and comp is 100. this only in 3 cly. and red light goes out. also when car heater is turn on the eng. increases to a high level and heater is turned off.. any help is appreciated

My car has 15000 miles.
My car has an automatic transmission.

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