Mehran cng running performance

[smarthief]

I have Mehran 2011 model, VXR CNG(factory fitted). Well I have a problem is that car running performance is not good. 8 months ago new spark plugs were installed at that time I told mechanic also do tuning of car but he said its look like no need for tuning, So only spark plugs changed so it was working fine and pick was also little adjusted so car was running good but now problem is that car performance going low, pick speed is so poor on both petrol+cng. Its very hardly reach 100km/h and then no increase, before that it was reach at 120km/h with no problem.

Now I need help from PW experts, what should I do to make my car again good and efficient. What kind of work need for it to make its engine more efficient. And one more thing I forgot, total car running is 50,662Km.
I will appreciate your helpful information

[smarthief]

Any kind of guide line? No response still from anyone.

[talhawaleed]

Eight months is a lot of time and you did not change spark plugs since then, you expect car to run flawlessly. Spark plus should be cleaned after every 5000km and changed after 20,000km maximum.

[nfsmostwanted]

get your car properly tuned

[gujar96]

check clutch and pressure plates if ok then get your car full tuned.

[smarthief]

check clutch and pressure plates if ok then get your car full tuned.

Clutch is ok because no problem in changing gyre but a little noise created when pushed. Don't know about pressure plates what should be checked in the pressure plates?

[gujar96]

Clutch is ok because no problem in changing gyre but a little noise created when pushed. Don't know about pressure plates what should be checked in the pressure plates?

That cannot be checked liked this take the car to 3S Suzuki Dealership near you and tell them the problem and ask them to check clutch and pressure plates. Thrust bearing can also be bad but for that also you need to open up transmission.

[yousufshaikh1989]

Just get your car properly tuned. This seems to be the only issue