Year is important. Earlier cars used CIS to 1985 which is purely mechanical and later cars from 86 on used CIS-E which is mostly mechanical but had 02 sensors.
When the engine is cold, a cold start injector may be assisting along with the auxillary air valve to give more fuel and air that may cause it to run better. Those may be stuck which can impact hot running. As will the fuel mixture , vacuum leaks , so on.
The testing process on these cars is very manual , requiring fuel pressure guages, smoke maxhine , timing light and exhaust gas sniffer. Give us the year and we will be able to offer better suggestions.
When the engine is cold, a cold start injector may be assisting along with the auxillary air valve to give more fuel and air that may cause it to run better. Those may be stuck which can impact hot running. As will the fuel mixture , vacuum leaks , so on.
The testing process on these cars is very manual , requiring fuel pressure guages, smoke maxhine , timing light and exhaust gas sniffer. Give us the year and we will be able to offer better suggestions.