Hi guys i have a opel astra G 1.8 16v. Engine was redone. The car starts but is rough so after 2 weeks of looking around i found out that only number 2 and 3 intectors pulses and number 1 and 4 doesn't. What could be the problem of this? Does the top cam sensor pulse 1 and 4? And bottom crank sensor pulse 2 and 3? Please if anyone can help me.