It retards / slows the timing up and makes the transmission shift hard. The engine has to be running right for the transmission to work right. It would really help to know the year. There could be other problems depending on the year.
The year, make, model and engine info would help but in general it could be a vacuum leak or time for a tune up.
Depending on the vehicle the check engine light would illuminate.
The year, make, model and engine would help us.
If i new the year of engine it would help on the answer. So check these few things first. plugs, cap, wires, Injector, Low are no compression on a cylinder. EGR valve whitch would lean out 2 cylinders and cause a no idle or real rough idle. A vaccume leak.
The year, make, model and engine size would help us help you. In older vehicles (pre-fuel injection) vapor lock was an issue.
The year, make, model and engine info would help us help you.
Probably not. A plugged cat would cause a loss of power and the check engine light may come on depending on what year and model vehicle you have.
The year, make and model info would be helpful but a large vacuum leak could do that.
The year, make and engine info would help us help you.
This would be a model year 1967 Type 2, or bus engine.
Wiring/circuit damage, fuse, the year, make, model and engine size would help us.