check fuel pressure and vacuum at idle. if vacuum is 15" or belwo suspect converter problem.

Answered by hmac300 (expert)
17,879 answers provided

at idle (without gear shifting) its static but at standing position it picks race with a delay. Also in addition to the information, its for a time running on CNG gas but giving this dropping rpm issue in both (with CNG & Petrol)

Can it be a problem of Compressor or compression from valves or piston? what do you feel with overall situation?

Please suggest me about it.

Response from newtech_autospk
1 question asked

running on cng normally requires an engine with a bumped up compression but should haveno effect on your problem. do the schecks that i've suggested first. You have to have a starting point and not just guess your way through a repair.

Answered by hmac300 (expert)
17,879 answers provided

thanks for your advises, we already proceed with your suggestions if any problem persists, 'll revert back to you.

Thanks once again.

Response from newtech_autospk
1 question asked