Engine misses when warmed up

Tiny
SUNSARO67
  • MEMBER
  • 1998 MITSUBISHI MAGNA
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 130,000 MILES
The car is running beautifully when the engine is cold but misses when warmed up. No CEL(check engine light).

Replaced all spark plugs, ignition leads and distributor cap but to no avail. Checked the injectors noise with a stethoscope and found okay. Firing is okay when checked the ignition leads with timing light. I am struggling to find where the problem is. I suspect leak in the head gasket or faulty o2 sensors or faulty air flow meter. If head gasket leak how to find out the missing cylinder? Can compression test be done when the engine is hot as the miss is only happening when hot?
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Tuesday, November 1st, 2016 AT 12:51 AM

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Tiny
HMAC300
  • EXPERT
You can do a compression test anytime, but check for a vacuum leak like broken hose, intake gasket etc. you can use choke cleaner for intake if rpm's changes you found it. also check fuel pressure with a gauge auto parts rent it in US.
see link.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Tuesday, November 1st, 2016 AT 6:05 AM

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